Ok, I just confirmed with Apple online chat. 'Holiday Return Policy' is currently in effect. Full refund as long as you initiate return by Jan 8th. Which means you can use the iPad Pro until well into late January as long as you print out the return courier label by Jan 8th. Then you can probably continue using it for another week or so before you have to ship it. Most probably if you're still using it by then you're keeping it.
Thats great news. Thanks for clearing that up. Although I was planning on returning to get the 128GB + Cellular. I can possibly wait a bit longer.