Sadly this is one release I'm not losing sleep over.
The bastardization of Spaces and Expose into the Frankenstein child called Mission Control is enough to keep me away from Lion for a while (if you have the GM, for giggles open 16 spaces and then try to efficiently close them. Or open Safari, go full-screen, press Command-N a few times to add full-screen windows, then Command-W to close them each in succession). Mission Control is indeed a clusterf*|< when lots of apps are open.
If I do upgrade it'll be on a secondary machine after the .2 or .3 dot-release.