Credits to @Spake for showing me this. I believe most of you guys have heard of Mojang's April Fools prank this year. The 15w14a snapshot. But there's a hidden QR code in it. I believe this is legit. Minecraft 1.9: The Combat Update. Spoiler: There's also this thing
I hope there will be new combat movements. I also think Dinnetbone mentioned something about The End being changed.
The Ender Dragon boss fight is getting a revamp and there will be the ability to have multiple boss bars.
What I'm hoping for in the Combat Update is possibly a new type of fighting. I mean, the two types of combats (Ranged and close) are used on-ground. How about a new type of fighting in the air? I know that's possible with plugins, but how about that in vanilla? The ability to fly in the other gamemodes except Spectator and Creative? That's obviously possible if entitydata worked on players too, but that's probably not going to happen due to it making UUIDs changeable. Which is something easily avoidable, so I don't exactly understand why that's not implemented.