They have a handful of announced heroes that are gonna hit the shop sooner or later, which if you bought the $200 founder pack is also pointless since they are already given free to that tier. More costumes and cards I'm guessing is what they will keep adding.I guess so, it's not like they have a whole hell of a lot to spend it on though. I guess lottery tickets and xp potions.
*Also I'm looking at running dailies and challenge modes if anyone is looking for a team. Name is Jellyfinger with a 32 Deadpool and 16 Colusses.