Learn French: Maintenant, il s'agit d'un nouveau reportage en direct.

In the expression il s'agit de (it is about / it is a matter of), the il is impersonal, much like the "it" in "it is raining." It doesn't refer to "he" or any specific noun mentioned earlier. Also, notice how de drops its vowel and becomes d' because the next word, un, starts with a vowel sound.

Can I conjugate s'agir with other pronouns, like je m'agis?

No, s'agir is strictly an impersonal verb. It only ever exists in the third-person singular form, so you will always see it as il s'agit de. You cannot conjugate it with je, tu, nous, or any other subject pronouns.

Why is nouveau placed before reportage instead of after it?

Most French adjectives come after the noun, but nouveau (new) belongs to a small group of common adjectives that are placed before the noun. You might remember these from earlier lessons using the acronym BANGS, which covers adjectives describing Beauty, Age, Number, Goodness, and Size. Nouveau fits into the Age category.

Does en direct always mean "live" like in a news broadcast?

In the context of media, TV, radio, or the internet, en direct is indeed the fixed phrase for a "live" broadcast. If you wanted to say you were doing something "directly," you would use a different word like directement.