For all we know, the surprise could be the string "WTF". All you know is that you'll get something digital. Some of these whatevers are more common than the others. They don't open until a "certain" date, which I can't find a hint about. I'm betting it's after all the credit card payments have cleared, though.
Oh, and do you see anything there saying Atari has any involvement in this at all? I see their logo at the top, but that's it. It's run by something called Republic Realm. Who's that? Can you even tell what nation this company is in?? I can see who's running this forum and where they are at the bottom of every page. Most sites have some sort of 'contact us' section. All this has is an email address.
So yeah, stinks to high heaven.
P.S. If you want to transfer it, you've got to pay a fee. How much? Depends.