When will the new iPad come to Sprint?
So far it's AT&T and Verizon only, which isn't surprising given Apple's push to LTE and Sprint's lack of LTE deployment to date.
AT&T's LTE iPad will work on Canadian networks like Bell, Telus, and Rogers, but Verizon's LTE iPad is unique to that network.
I wouldn't buy either hoping it becomes compatible with Sprint LTE at some later point. Apple might spin off a third LTE model just for Sprint.
Since the iPad is month-to-month billing, however, and has no contracts, you could always rock an AT&T or Verizon LTE iPad for now, then sell it and buy a Sprint one when/if it becomes available.
Either way, I'm guessing we'll see it eventually, even if not soon.