If you've been wondering, and many of us have, Faisal Mohamood, LINQ to SQL Program Manager, gives us a hint in this blog post: Coming soon to LINQ to SQL. It's hard to tell if he's talking about things coming in VS2008 SP1 or if we will have to wait much longer.

Update: Charlie Calvert's blog indiciates that these are for next release. But that doesn't quite clear it up. I'll just pretend that I believe this means, literally the next time something is released, which translates to SP1.