Probably not, its more mirrorless even tho mirror is still there, but its EVF based camera. Sony wont make dSLR in future. Cause of that I doubt they will match D800, there will be loss of SNR due half-silvered mirror if I dont count that one which will be caused by different CFA and Sony usuall approach "colors over everything" (which is why I like them :). Plus D3x didnt performed like A900 either (cause Nikon is pretty good in squeezing Sony chips). Tho as main supplier for Nikon, they actually profit either if Nikon wins.
Im quite interested in what should be "lower" Sony model with 24 mpix FF (revised or new chip supposedly). Imagine 36 mpix A99 priced around D800, then decent 24 mpix FF priced quite a bit lower.. :D