NOTE (09/10/2011) : The Sync Framework v4 CTP bits has now been released as Sync Framework Toolkit. see: Sync Framework Toolkit now available for download
Just in case you’ve missed the announcement, Sync Fx v4 which was supposed to hit RTM this 2011 has been postponed for the time being.
This is bad news for those who has been eagerly awaiting its release and even more bad news for those who has made time to test it’s CTP releases and made plans on using it on their own projects.
The good news is that they plan to release the v4 CTP functionality as sample code on MSDN.
Check out the announcement here: http://social.microsoft.com/Forums/en-US/synclab/thread/2c6f1ab8-fed4-4c43-9a55-93002a9a8e02