The new typed dataset designer with Whidbey automatically adds table relations to the typed dataset if you drag tables from the solution explorer. It's no longer necessary to add the relations manually to the designer.
Another feature of the typed dataset is that the generated class implements the new interface System.ComponentModel.IDataLoader. This new interface defines 2 methods: LoadData and SaveData. With LoadData it is possible to get the data from the database without creating a SqlConnection and SqlDataAdapter.
SaveData is not implemented with the alpha bits.