How does everyone feel about the new theme? It's much more traditional with the user profiles on the left and, for me anyways, it seems like it's a lot easier to keep track of everything. I think it's nice and clean.
I will be installing more and you will be able to choose whatever one you want in your User Control Panel.
If you want the original one back, or to choose when there are more available:
Click on "User Control Panel" in the upper right
Click on "Board Preferences"
Change the "My board style" option.