The SharePoint Team Blog lays out a lot of the updates on their blog. One of the most critical is the holes they’ve filled in the documentation. This is an area that’s been brutally, horrifically, pathetically terrible in the initial release. I’ve ranted about this a number of times already, so I’ll just leave this part off with another small one: the state of the initial documentation was unconscionable. It’s taken far too long for them to clean it up, but at least they’ve applied more resources and are closing the gap.
Now go get v1.2 of the SDKs!