The Minecraft community has been waiting for an end update for a long time now. I think Mojang might have been secretly working on a huge end update and isn't ready to release it. Or they could just be avoiding an end update for some reason. Maybe they want the end to be plain because it is the "end". I do hope they add a new boss. The wither and the ender dragon are boring. The good thing is that there are tons of mods that add new bosses.