Unfortunately I encountered several bugs in this snapshot. 

First of all, I foud out that there's some kind of problem with the updating of blocks. I first discovered this when I tried to break a block of dirt and it started to break all other blocks nearby. Then I went to a nether portal and it didn't teleport me, either in creative or survival mode, and eventually started breaking "portal block" by portal block, and then netherrack started to generate inside the portal. Lighting the portal up just worked only on the single blocks composing the whole portal. Then I also found out that I could insta-brea all blocks, but when updated (I used flint and steel) the got back.

The last thing I discovered is that when I die, the character's soul kinda get out of its body. I know it may sound strange but the camera got "out of the character" (in fact I could see my own name tag) and all stopped moving, even if I re-logged. (note that I was not on a server)

I would have really liked to attach a video but I couldn't because too long. Here are some screen tho. 

Oh, and some cheats (such as /weather clear) didn't work as well.