Mix08 is mixing... from 5. till 7. March in Vegas. First keynote will start at 9:30 AM PST (5:30 PM GMT and 6:30 PM CET) and will be held by Microsoft Chief Software Architect Ray Ozzie joined by Scott Guthrie, Corporate Vice President, .NET Developer Division, and Dean Hachamovitch, General Manager of the Internet Explorer Team. Somewhere I already read that public beta of IE8 will be announced at Mix. Also, Scott Guthrie announced that next CTP of ASP.NET MVC will be unveiled at Mix. I am almost sure that this will happen today... almost sure.
Keynote will be available online, as announced by Tim Sneath. Here is link to 100kb streaming, and here is virtual pressroom at ms prespass. My colleague Radenko Zec have won a trip to the MIX, for his SilverReader, at the '1st European Silverlight Challenge', and he is already fascinated with mix and Vegas.