I know some sites have those specs, but you won't find it on T-Mobile's site
. For now, I'll believe the guy that actually asked Samsung
I confirmed with a Samsung contact that the T-Mobile version of the Samsung Galaxy S II does NOT have the name brand gorilla glass from corning, but it does have reinforced/fortified glass (their words not mine).
It really doesn't matter to me whether it does or not. I'm not going to sell my phone or like it less because it doesn't have Gorilla Glass.
I may sell it to get the Note 2.