Never buy a new untested device in the hopes that it will get hacked. There was plenty of communication here about the new Kindle Fires being locked down weeks before it was released so that was probably not the best choice for you in the first place. If it gets modified, then it gets modified. If not, well, so be it. If you're worried about being able to exchange it, then go ahead and do so. Don't mess around with your investment. Get something you know suits your needs and be happy with it.
If you're wondering if it will EVER get modified, there's an old saying...
"The only "safe" system, is one that is unplugged, locked up in a safe with the keys, and sitting at the bottom of the ocean. And even then, there's cause for alarm."
Security measures are fallible, because the humans that made them are fallible. It all depends on how badly someone wants it. (I wouldn't hold my breath though)