Because of the problems with WPF/E timing out last evening, Microsoft has deployed the February control early (IMHO).
There is a new agHost.js as well, but the SDK and samples aren't up yet.
Mike Harsh blogged about it last night but unfortunately I didn't see it until this morning, and can't get to my site to update the agHost file there, so that'll be dead all day :(
Here's the links:
On the Plus side:
No changes appear to be necessary to the agHost instantiation script to support existing xaml, so that's good.
I've seen a fun list of enhancements so I'm anxious to see the new SDK!
Here's the blog message about all this from Tim Sneath.
Quick work getting us back running everyone... Thanks!