According to the GS rep I spoke with at one store by my house, they apparently cut off all pre-orders for the Borderlands 2 Ultimate LootChest edition yesterday, which was the last day. Supposedly won't be coming back, unless 2K decides to make more of them, which at this stage of the game, is still an option.
Maybe this this will actually be limited after all, if they've cut off pre-orders with less than two weeks since pre-order being an option.
Unless I'm mistaken, didn't something similar to this happen with the Dark Edition for The Witcher 2: AoK Enhanced Edition
--i.e., preorders became unavailable at Amazon, GS, and BBY a few weeks after being announced? If so, then there's still hope of Ultimate Loot Chest Editions popping up on Amazon as the release date approaches, like what happened with the Dark Edition.
I wasn't even considering getting the ULC Edition, but with it potentially being a hot collector's item, I might have to jump on one if it ever reappears for preorder.