I got this info from Gamestop:

"You're probably going to get Metal Gear Solid: Portable Ops anyways, but if for some crazy reason you're still on the fence, Konami has offered one of the cooler pre-order bonuses I've seen in quite some time. Pre-order the game at Gamestop and you'll get a case for your system for free. Not just any case, though. A pretty spiffy-looking silver case with the image of Snake giving a salute. "

There's an image of the case here:
http://www.gamestop.com/product.asp?product%5Fid=B190355A
It looks good, but I'm happy with my PGP.
I'll probably still get the game when it comes out though.

I have that case and its the best case I've seen since the cases that Pelican came up with