Mr.S:
According to this page: hxxp://msdn.microsoft.com/vstudio/productinfo/roadmap.aspx "Orcas" is the codename of VS 9.0 (basically the release after VS2005), which will be released in the Longhorn timeframe, with Lornhorn specific development features. VS2005 was always and is still codename "Whidbey".
Also, the WinBeta guys say the release that came out on irc.betasirc.net had problems, though they didn't say what specifically. I am uploading the WinBeta release, which they claim is fixed.
Regards