I have a tip for Verizon customers, though your mileage may vary:
After getting no confirmation emails and not seeing any updates on the Samsung/PrizeLogic promotion site, I contacted Verizon (I ordered over the phone and the reps send an email directly to you after your order) just very kindly/politely saying that I was having issues with the promotion site and was concerned about the updated terms indicating that I may not get an S2 until late summer or not at all, asking if they could possibly fulfill it through Verizon. Again - just super polite and nice and like, "if you can't do anything I understand."
I got a call a few hours later, and while she said they couldn't send me one for free, she could take $200 off whichever S2 I preferred, so I ended up getting the white/silver 3G/4G variant for only $99 billed to my account with overnight shipping (should get here today.)
Ironically, the Samsung site now shows my submission is approved and shipping is pending, though I haven't gotten any emails. Even if its the Gear VR, it can be sold to recover the cost of the watch. If its the watch than I made out damn well.
But anyway - just wanted to share my experience. If you get the right person (preferably sales not customer service) and are super nice, they may be willing to help you out. I've seen some others post about having the S2 sent to them for nothing at all as well, and I imagine if I had pushed it I could have gotten that as well.