And it's not just Carmack and Abrash - they also have Tom Forsynth [0] and Atman Binstock [1], two other amazing people who've been pioneers in graphics programming and VR (and AR) development! And it's very likely that Valve will soon be firing most people who worked on their VR prototype, which means that it's possible that Oculus VR picks them up as well.
It's the closest thing to a dream team for nerds: Abrash and Carmack, two of the people who completely changed an entire industry in the 90s; Luckey, the definition of a true hacker who helped revive a dying market (if there ever was one in the first place); Forsynth and Binstock, who also played a key role in many areas in the games industry; and lastly, Zuckerberg, a ruthless nerd with impossibly-deep pockets.
[0] http://home.comcast.net/~tom_forsyth/ [1] http://www.oculusvr.com/blog/welcome-atman-binstock-chief-ar...