The control has been releases / is publicly available.  Chris Pendleton has the details in his post titled New Virtual Earth API Release – Virtual Earth 6.1.  The Virtual Earth Interactive SDK & full Virtual Earth SDK have not been update, but the updates should be out some time today.

Now that it is out, we will begin work on updating the Virtual Earth JavaScript Intellisense Helper to be in sync with any updates to the 6.1 API.