If you have not yet downloaded a copy of the 4.5 EAP I suggest that you go now and give it a whirl.
So far everything is looking good. One of my favorite additions so far is the modified naming style page:
Notice how most of my Entity kinds settings are set to “all_lower”. This is awesome, because now ReSharper will suggest underscored member names for me all over the place. It is a small addition but great.
Develop With Passion!!