WOW. I never imagined that anyone would have seen the mediocre prequel but not the ridiculously amazing original movie, which is an absolute classic, and perhaps the greatest exemplar of its genre. Excuse me while I compose myself and recover from the shock...
The filmmakers had the idea that the prequel should end exactly where the original movie begins - namely, with the Norwegians in the helicopter chasing the dog-Thing. If you actually sit down and watch the two movies back to back, you will see that this is pretty much the way it works out. The prequel did almost everything wrong, but this is one of the few exceptions to that rule.
The screenwriter, a man named Eric Heisserer, did an interview with the website Quiet Earth, which seems to be offline at the moment, but I have the relevant extract from the discussion.
If we do this right — I just spoke on the phone today with [Producer] Eric Newman on the phone today, he's on set up in Toronto [and] he said things are going well. But if we can pull this off, this movie will work perfectly [as] the first half of a double feature. So that the last shot of this film will be two Norwegians and a chopper chasing after a dog. And you can plug in Carpenter's film and they will both feel and look as they have been made around the same time.
Seriously, though- you really need to watch the REAL version of The Thing - the one John Carpenter made.