The long awaited XNA Game Studio 2.0 beta is now available and can be downloaded from the XNA Creators Club website:
http://creators.xna.com/beta/betahome.aspxMy first impression of the new multiplayer API is not that good. While it is very nice to have the ability to use networking on the Xbox 360, it is not only too hard to make it work on just a Windows PC and secondly you cannot expect that your gamers will both have a Xbox LIVE Gold membership AND a XNA Creators Club membership (both cost money). This means if you really want to do networking on a Windows XNA 2.0 game, you have to use System.Net and write it all yourself or no one will ever play your game on Windows except some XNA developers maybe.
Other than that XNA 2.0 is a great improvement, but it does only work with VS2005 yet, maybe they missed the VS2008 release earlier yesterday ^^ But it will probably be possible to modify the .csproj files again to make it work in VS2008 (without the extra XNA features and content pipeline).