Vodafone v1615 to receive WM 6.1

The Vodafone 1615 (also known as the HTC TyTN II) will be getting Windows Mobile 6.1 pretty soon, as it is currently being tested by Vodafone. Owners of the Vodafone 1615 will be able to receive the upgrade sometime at the end of this May, assuming all goes well in the testing phases. How much longer do you think other networks will follow suit with the Windows Mobile 6.1 after Vodafone rolls theirs out?