a lead moderator on slingcommunity says that both 3g and wifi should be supported
"Unfortunately we have no idea when Apple will make this available on their apps store. Apparently they are way behind on approving apps.
But both wi-fi and 3G should be supported."
http://www.slingcommunity.com/forum...-for-iPhone-iPod-Touch-Forum-Now-Open/#100647
My money is that it works on 3g and Wifi. ORB was approved, NCAA streaming of the tourny was, AT&T already allows Sling to run on other phones, alongside the fact they sell their MobileTV pack. The only way 3g doesn't make it if Slingmedia doesn't have it optimized as Apple would like and considers it a bandwidth hog. ORB first came out Wifi only, a week or so later, 3g was in an update.
The only other thing that came to mind is it comes out Wifi now and then Apple/AT&T introduce it's available on 3g in June with the new iPhone, claiming the higher speeds for better streaming etc...
I just hope the app releases before June