Minecraft wiki entry for Development_versions, associated text: Players can be now be kicked or banned from worlds by pausing and going to the "Player Permissions" screen.
Anyone with Operator permissions will be able to kick players.
Kicked players will not be able to rejoin LAN games while the world is open.
Realm owners can now change permissions of players in their Realm from the "Player Permissions" screen.
Latency value is now provided separately from the user count when in a multiplayer world.