Learn Hardcore Greek: Θα περιμένουμε στη στάση μέχρι να έρθει το λεωφορείο. - We will wait at the stop until the bus comes.

Θα is the particle that marks the future in Modern Greek, so Θα περιμένουμε corresponds to we will wait / we’ll be waiting.
It’s not a standalone verb; it combines with the verb form that follows. Depending on context, it can express simple future, intention, or prediction.

Why is it περιμένουμε and not some special “future” verb form?

Greek doesn’t form the future by changing the verb ending into a special future tense. Instead, it uses Θα + verb.
So περιμένουμε is the present-tense form of περιμένω (I wait), and Θα + περιμένουμε gives we will wait.

What person/number is περιμένουμε?

περιμένουμε is 1st person plural: we wait / we are waiting.
With Θα, it becomes we will wait / we’ll be waiting.

Does Θα περιμένουμε mean “we will wait” or “we will be waiting”?

It can mean either in English. Greek often uses the same structure for both:

Θα περιμένουμε = we will wait (simple future) or we will be waiting (future ongoing), depending on context.
If you needed to strongly emphasize “for a while / continuously,” Greek might use context or other phrasing, but this sentence is already very natural.