If Takara still has the G2 Grimlock mould (which I'm personally skeptical about) then they would reissue it with G1 colours. They did the same with the G1 Prime reissue (w/ new arms), Jazz (w/ the hole removed from the roof and reconstructed rear window panels for the Hasbro version and Stepper) and probably for Sideswipe and Starscream too (I don't see that much difference between their G1 and G2 moulds - 'cept for the hole in Sideswipe's roof which they could've easily patched up like they did w/ Jazz). I don't own G2 Inferno so I dunno if there were any G2 mould elements in the Inferno reissue.