Continuation of the series games? (inFamous: Second Son)

Continue to be, at the time, but will continue the story Delcina the big question, though a good ending gives a nod.

And what do you hear about the sequel? Now what do developers do?

It is not clear what will happen. Second Son can see that done in haste. Plus Sony had to reduce the ranks of Sakarov. Most likely will be engaged in other games.

there are also GTA 5 mission with Michael where he flies in the colored filter after Smoking it?

When will the PS5, then the new Infamous will be released.