I hope the update does not interrupt PC gamer Evan Lahti's 3 hour livestream :P http://www.pcgamer.com/2012/05/18/watch-our-day-z-livestream-today-3-pm-pst/
To flush you need to do the following key sequence ingame: Hit left ctrl then left shift and then NUMPAD Minus (on the far right side of the keyboard) and then type: flush That should correct some visual glitches.