I am not going to thread to quite the game, that will happen when it will happen, but I will get annoyed by feeling that "I have to" grind up to level 100... (it is like "all open event" please get rid of it, it feels like working on the game instead of playing it... just make double reward events)
you already did the orange +1 and +2, heroes can get more power already... like people say farming and grinding is not especially funny... At least for orange+1 you just need to wait... (or try to get better ranking, which is quite fun, because you have the challenge of thinking about a team that can defeat the other leader).
Releasing chapter 15 and 16 that's cool too, but maybe you can do that without lvl 100?
and what about the guild wars, which I have no idea of what is it but I read it here quite often?
That's my opinion.