I'm very excited about the new media uploader, so I just tried it locally.
However, when I select media to create a gallery and click on insert, the images are not inserted as a gallery but just normally. I don't see any options for columns either.
Another thing I noticed was that images are not attached to the post they're uploaded in if you don't insert them in the editor.
I develop things with WordPress, but I'm new to these fora... just trying to help!