Nothing new here, but Peter Drayton answered a question about the next version in one of the Rotor newsgroups:
The current version of Rotor is still 1.0 - mirrors the 1.0/1.1 CLR releases. The next version will be 2.0, matching the 2.0 CLR which is the foundation for VS2005 (codenamed Whidbey). It will be released after Whidbey goes RTM in 2005.
When I was at Win-Dev, Ernie and I (as well as Sam separately) asked Kit George about progress on Rotor. He confirmed that Peter is the one to watch for when it is available.
We (Sam, Ernie, Andrew, myself and many others) are very much looking forward to this!