End-game Bosses.

Are the End-game bosses gonna have new abilities, allies to aid them or changes on their abilities/wave in order to increase the "epicness" of their majesticity or are they gonna be plain bosses with higher lvl, or anything else?

If you're asking us then...End Game bosses gain nothing special. The only changes are higher stat and the same yet tougher enemies in lane you have to deal with.

If you're asking Trendy then...I don't know. Ask in next Devstream and I still don't know when.