Select Best Buys now have demo units available to play with, so I went and got my hands on one today.
First of all, they only had them in white, and the white version doesn't feel good at all. The back looks like it would have a soft texture, but it's hard slippery plastic.
The new version of TouchWiz definitely looks better, but it still seems very cluttered to me.
It doesn't feel as smooth and fast as my stock Nexus 5 running ART, but it's almost as performant as a Nexus 5 running Dalvik. TouchWiz is obviously still heavy because it should really be faster than the Nexus 5 with that Snapdragon 801.
ART is not available. I tried to enable it to see if it would make it as fast as my Nexus 5, but the option has been removed by Samsung.
Can't say much about the camera because it's hard to judge pictures of the inside of Best Buy. It did focus and capture fast though.
That's all for now. Will update as I think of more.