While it is definite that I will receive the update for 4.3 on my Nexus 7 within a few a days, I just want mention on this thread that most of the best video player apps (MX Player, BS Player, Dice Player) are either not fully functioning of not working at all on 4.3.
I use BS Player every day on all my devices, so my excitement for the new update is tempered by the reality of development catchup. I also have yet to hear if the flashplayer sideload will still work.
Also, if you are in the market for a tablet and you can afford it, I recommend getting a Nexus 7 or Nexus 10 for the pure Google experience. I've been on 4.2.2 on my N7 since November and it has allowed me to relax a little about not getting 4.1.2, 4.2.2, or 4.3 on my AT&T gs3.
Finally here is a little logo-swapping info graphic to entertain you while you grow your beard waiting for AT&T:
With global warming, even glaciers are moving faster than we do!
You think you've been waiting a long time already, that's just the tip of the iceberg!