One of the questions today was about WCF vs. RPC. Richard Turner covered this rather well last year, so to avoid churn, I'll provide the link here:
http://blogs.msdn.com/richardt/archive/2005/09/08/462484.aspx
The other question was around performance. While I have no numbers I can share externally, I did want to re-iterate that the intent is to be as good as, if not better than the existing stacks.
A non-blue badge, Guarav Khanna, did some independent tests that he posted, those can be seen here: http://geekswithblogs.net/khanna/archive/2006/01/06/65067.aspx