It was clear talking to the MS guys at the PDC that the focus has been on shipping Yukon and not the next version, to the extent that work on the next version was stopped to focus on Yukon. As we are getting nearer the ship data requests for the new features in the next version are starting.
The SQL Server Engine team have asked for requests on their blog http://blogs.msdn.com/sqltips/archive/2005/09/22/473101.aspx, whilst Kirk has asked for requests for the next version of SSIS on the forums http://forums.microsoft.com/msdn/ShowPost.aspx?PostID=89737.
So if there is something you don't like or something you want ask now whilst the next version is on the drawing board.