At the end of the day, whether it's open or not or Linux or not doesn't really phase me. I just want it to play well with whatever GPU I have at the time, be it AMD or nvidia. I've already spent more on SC than a new copy of Windows would cost me and frankly I don't care if it's open or not as long as it's well implemented on both AMD and nvidia cards, it's gonna suck balls if you buy an nvidia card 6 months before SC comes out and then end up having it play like shit compared to an AMD card.
well, 6 months from release we should know enough by then about mantle that people could make an educated decision on what gpu to buy, and by then Mantle might be in the cryengine and already working in the alpha/beta phases of Star Citizen