Here's a BlackJack-look-alike that Mobiledia (among others) is reporting should come to Sprint early next year. It looks like a pretty straightforward YAQKWMS. They're calling it the i325, which might make is a sort of spiritual successor to the GSM-only i320 of yesteryear (the::unwired) - certainly there are some shared design cues.
In any case, Sprint is a little short on the Smartphone-side of Windows Mobile. That Motorola Q9C is awesome, but it needs a more inexpensive little buddy - this 'Ace' should fill that slot nicely.