As you may have discovered, the Minecraft 1.10 update is now available as of today. There's quite a few new things including polar bears and new hostile mobs, new blocks, and new features in the terrain generator.
Notably, one of the most obnoxious changes is the addition of an autojump feature when encountering single blocks above your current height. For some of you, it might be a welcome addition, but if you wish to turn it off, you can disable it from the options -> controls dialog. I've found it thusfar to be more of an annoyance, but it's worth experimenting first before you disable it.
While I won't be regenerating terrain on my server with this update, I will probably be posting a map interface somewhere so you can see what terrain has already been explored should you wish to cover new areas that haven't yet been generated.