I guess what I am most curious about is whether any successor will have the same gameplay at all, or whether we'll be playing an entirely new and different game that just happens to be set in Paragon City, or even in some other city with characters saying ''Yeah, I used to live in Paragon, but I moved here recently. Glad I don't have to deal with Rikti anymore!''
Also, each game being CoH 2, means that there isn't really one official continuation, just various Elseworlds continuations.