Okay, have we actually confirmed that Guardians didn't have a slight greenish tint in 2d theaters? I saw in theaters, but our eyes adjust to blanket tints really quickly, and it's entirely likely that it had this slight bit of greenness which was removed for the 3d showing as part of the brightening they did.
It would be really strange of them to introduce it on the bluray for no reason. I'm guessing it was always there and we didn't notice.