ScottGu’s announced about VS 2010 and .NET 4 Release Candidate releases. RC will be avaible in February.
The goal behind the Release Candidate is to ensure that performance problems in Beta2 are fixed and products are ready for RTM release.
ScottGu says this will postpone the RTM release a few weeks. I think every developer who will use this products can wait a few weeks for a high quality.
For more information you can read Scott’s blog entry.