yes, if you pre-order it you will recieve a code with the game that will give you an upgrade to the signature version source:http://www.gamestop.com/xbox-360/games/tom-clancys-ghost-recon-future-soldier-signature-edition/77068
IMO, the signature edition content isn't really worth paying "more" for. I say "more" because you don't get the $10 credit and you have to pay tax on Gamestop (SOME states you'll pay tax for Amazon too though).
Yeah I might re-pre-order mine here as well. I initially wasn't gonna bother with this game but if it makes my Resistance: Burning Skies 10 dollars cheaper, eh why not. Plus I think Amazon actually has the best pre-order incentives on this one.
i don't really care about pre-order incentives, although i'm certainly not going to complain about $10 credit, but i always order through Amazon because you can't beat getting the game on release day for $0.99, so not only do i not have to pay additional tax etc on the game but i also don't have to either pay more to have it shipped or have to actually drive down to the nearest gamestop to pick it up (my gamestop is a good 30-45 minute drive from me)