Den nya grannen ska vara fotograf, och hennes syster ska ha öppnat ett café vid torget.

Here ska most likely expresses reported information / assumption, not a strong future meaning and not direct obligation.

So:

• Den nya grannen ska vara fotograf = The new neighbor is said to be a photographer / apparently the new neighbor is a photographer
• hennes syster ska ha öppnat ett café = her sister is said to have opened a café

This use of ska often means:

• I’ve heard that...
• Apparently...
• It is said that...

In other contexts, ska can also mean:

• will / going to
• shall / must / is supposed to

So the exact meaning depends a lot on context.

Den nya grannen means the new neighbor.

This phrase shows a very common Swedish pattern called double definiteness:

• den = the
• nya = new
• grannen = the neighbor

When a noun is definite and has an adjective before it, Swedish usually marks definiteness twice:

1. with den/det/de
2. with the definite ending on the noun

So:

• granne = a neighbor
• grannen = the neighbor
• den nya grannen = the new neighbor

You normally cannot just say nya grannen in standard Swedish here.

Because the adjective is in its definite form.

Compare:

• en ny granne = a new neighbor
• den nya grannen = the new neighbor

When an adjective comes before a definite noun, Swedish usually uses the -a form of the adjective:

• den nya bilen = the new car
• det stora huset = the big house
• de gamla böckerna = the old books

So nya here is not plural only; it is also the normal form with definite nouns.

Because Swedish normally uses both:

• a separate definite word: den
• a definite ending on the noun: -en

This is exactly the double definiteness pattern.

So:

• granne = neighbor
• grannen = the neighbor
• den nya grannen = the new neighbor

English only marks definiteness once with the, but Swedish often marks it twice when there is an adjective.

After vara (to be), Swedish often omits the article when talking about someone’s profession, role, religion, or nationality.

So:

• Hon är läkare = She is a doctor
• Han är student = He is a student
• Hon är fotograf = She is a photographer

That is why the sentence has:

• ska vara fotograf

not usually:

• ska vara en fotograf

Using en here can sound different, often more like one photographer / a certain photographer, or it can feel less like the normal “profession” pattern.

Because the two parts refer to different kinds of information:

• ska vara fotograf = someone is said to be a photographer
• ska ha öppnat = someone is said to have opened a café

The second part uses ha + supine (ha öppnat) because it refers to something completed earlier.

So:

• ska vara = is said to be
• ska ha öppnat = is said to have opened

This is similar to English:

• She is said to be a photographer
• She is said to have opened a café

Öppnat is the supine form of the verb öppna.

In Swedish, the supine is used with har/hade/ha to make perfect-type constructions:

• har öppnat = has opened
• hade öppnat = had opened
• ska ha öppnat = is said to have opened / will have opened, depending on context

Important distinction:

• öppna = infinitive
• öppnar = present
• öppnade = past
• öppnat = supine

So in ska ha öppnat, öppnat is there because it follows ha.

Because café is a neuter noun in Swedish:

• ett café = a café
• caféet = the café

Swedish nouns have grammatical gender, and many learners need to memorize whether a noun is en or ett.

So here:

• ett café is correct

Because possessives like min, din, hans, hennes, vår already make the noun definite in meaning.

So:

• en syster = a sister
• systern = the sister
• hennes syster = her sister

You do not add en or a definite ending here:

• not en hennes syster
• not hennes systern

This is similar to English: we say her sister, not the her sister.

Because torget means the square / the marketplace, and Swedish often uses the definite form in places where English may or may not.

So:

• ett torg = a square
• torget = the square

vid torget means:

• by the square
• near the square

In many real contexts, this refers to the central or locally known square, so the definite form is natural.

Vid usually means by, beside, at, or near, depending on context.

Here vid torget means something like:

• by the square
• near the square

It suggests location close to the square, but not necessarily directly on it.

Compare roughly:

• på torget = on the square / in the square area
• vid torget = by the square / next to the square

Because this is a normal main clause in Swedish.

Basic Swedish main-clause word order is often:

subject + verb + ...

So:

• Den nya grannen = subject
• ska = finite verb
• vara fotograf = rest of the verb phrase

And:

• hennes syster = subject
• ska = finite verb
• ha öppnat ett café vid torget = rest of the verb phrase

Swedish is a V2 language, which means the finite verb usually comes in the second position in main clauses. Since the subject comes first here, the verb follows it normally.

Yes, but it would mean something different.

• Den nya grannen är fotograf = The new neighbor is a photographer
  This sounds like a direct statement of fact.

• Den nya grannen ska vara fotograf = The new neighbor is said to be a photographer / apparently is a photographer
  This sounds less direct, more like reported information.

So the difference is mainly certainty / source of information.

Because Swedish, like English, can join two related clauses with och (and):

• Den nya grannen ska vara fotograf
• och hennes syster ska ha öppnat ett café vid torget

This simply connects two pieces of information. You could also split them into two sentences, but using och makes them feel more connected.

No. Ska ha + supine can have different meanings depending on context.

Common possibilities include:

• reported information: is said to have opened
• assumption / inference: should have opened / is supposed to have opened
• in some contexts, a more literal future-related meaning can appear

In this sentence, the most natural reading is the reported-information one: her sister is said to have opened a café.

So the structure is not tied to just one translation; context decides the best English wording.