Find my answers in order:
- We were supporting the Domain Data Source submit changes even in Q2.
- You can always set a custom CellTemplate that uses the MaskedTextBox. The good news is that we are adding a new GridViewMaskedTextColumn with the official release. Actually it will be available in the latest internal build that targets Q3.
- RIA validation support is available now with beta 2. We are doing other validation improvements that will allow you to plug any validation logic you want like enterprise library validation block for example.
Hope this helps.
the Telerik team