This is pretty crazy and amazing at the same time:
Also, just for reference, some other characters I saw confirmed on the AMA thing for the future are: Spider-Woman, Wasp, Polaris and Dazzler (the last two apparently are only "possibilities" right now).
On number of characters by game's end:
I think they game may last forever, since the dev team is very dedicated and very efficient + Marvel is really supportive + the backing of the company is very strong + the license is incredible.
So, at least 100+ Heroes and 200+ Team-Ups would be very easily forseeable.
Considering each hero is roughly equal to a class in other ARPGs, that is a huge amount of options for players.
Also, just for reference, some other characters I saw confirmed on the AMA thing for the future are: Spider-Woman, Wasp, Polaris and Dazzler (the last two apparently are only "possibilities" right now).