UPDATE #2: DOTA 2 officially confirmed! Also Dota Allstars added as promo title! By this list of the official games consist of DOTA 2, Starcraft 2, Warcraft 3, Cross Fire, FIFA 12. Promo titles are World of Tanks, Counter-Strike: Online and DotA AllStars.
UPDATE: Russian qualifiers for DOTA 2 scheduled on 28th of July which is means that WCG's national representatives get updated list of the games and now we can make a conclusion that League of Legends officially replaced by DOTA 2. Another additional confirmed games are Starcraft 2 and Warcraft 3. Stay tuned on GreatFrag.com for official information from head office.It is not officially confirmed yet, but seems that organizers of World Cyber Games and Riot Games didn't come to "win-win" agreement and in WCG 2012 we will see DOTA 2 instead of League of Legends.
Sounds little bit odd, because DOTA 2 still in closed beta. Anyway, shortly we will find the answers to all questions.
Remind you that WCG 2012 will be held on 28th November - 2nd December at Kunshan, China. At this moment confirmed gaming disciplines are Cross Fire and FIFA 12. Promo titles are World of Tanks and Counter-Strike: Online. Gaming list is not full yet.