yeah - heard it sold out really fast.
I used to go every year - last year was the 1st I'd missed in a long, long time. Was just getting too crowded to get into anything.
Check their website for the program listings a few days ahead and plan carefully - anything in Hall H ( where the big movie stars will be ) will require lining up hours ahead of time ( like 6 AM for a 10 AM presentation ). The other rooms get lines for an hour or so ahead too for popular presentations. On the other hand presentations actually about comics can usually be entered pretty easily. The Quick Draw they do every year is great fun - I definitely recommend it.
It's quite an experience. Also book your hotel as early as possible - the con gets some deals, but they go very fast too - so be ready as soon as they are available ( sort of like getting Con tickets themselves). Get one with bus service if you can. Parking is $$$.