The VTEC livery is applied using vinyl; or at least it was on the coaches I saw in Aug 2015 (not sure if they've been repainting as they've been refurbishing). Thus, seeing as the 800s and 801s are being delivered in plain grey/white and the IC225s (if, as I hope, LNER retains some as Virgin had planned) will be plain grey once the VTEC vinyls are removed, I think it likely that the LNER livery will be grey-based. My hope is that they will add a dark grey vinyl window band (to match the doors) to make it look less boring and then, when a repaint is due, paint the window band on (and while they are at it change the dark grey of the doors and window band to a dark blue, similar to GNERs original colour). The end result would be similar to the inverse 'Pullman' blue & grey, but different shades of both blue and grey.