Read from this what you will. This is Scott Guthrie replying to a post on his blog. Emphasis below is mine.

# re: Silverlight 2 Release Candidate Now Available

Friday, September 26, 2008 10:09 AM by ScottGu

Hi Ian,

>>>>>>>> Great to finally have a release candidate although I read a comment on Tim Heuers blog that you are 'still committing to shipping Silverlight this year' which is totally against the whole 'Late Summer',  'really soon' and 'which will be soon though' comments I keep reading on SL team blogs.  It seems almost an unsubtle way of saying it could be December.  The team I work with are currently developing an SL 2 Beta 2 app due to be delivered to our client in early to mid November.  However there are bugs in Beta 2 that are a real issue for us so we are kind of desperate to go to the RCO - we are not asking for a release date but would you be able to say that we can safely go to the RCO version and by the time we deliver our client will have no problem in using the app?

You shouldn't have any problems shipping your application in mid November.  Do let us know immediately, though, if you find bugs with the RC that are impacting your application so that we can investigate and fix them.

Thanks,

Scott