The event will feature panel discussions from Blizzard staff, tournaments, contests, playable demos of upcoming Blizzard games, an auction, and, of course, merch. Blizzard has yet to offer information about price, availability, or method of purchase for tickets. Keep rapid-firing F5 on www.blizzcon.com for more information. Actually, don't do that -- if Blizzard's servers crash, they'll just have to buy more, and the cost might show up in ticket prices.
[Via WoW Insider]