what i heard was at least 90 days.. went to one and they said the SK3 has been out for 3 months.. they STILL havnt been able to get it in stock due to high demand and corporate stores exclusivity.
I'm sure T-Mobile would like to push them from as many retail sources as they can but demand will tell the tale as far as when they're in non-TMO stores. It's a question of how many they have stockpiled and how fast they get scooped up.