The nightly builds are up: http://www.jetbrains.net/confluence/display/ReSharper/ReSharper+4.0+Nightly+Builds
There are some notes on what is new, and what is fixed at: http://www.jetbrains.net/confluence/display/ReSharper/ReSharper+4.0+EAP+Notes
... I can't wait to try it out ... looks yummy :)
Technorati: ReSharper
Disclaimer The opinions expressed herein are my own personal opinions and do not represent my employer's view in any way.