Also to add confusion, Ars-Art replaced Artstyle after TI1 in Na'Vi. Artstyle is currently not playing pro anymore, even though following one of v1lat's random tweet(russian caster, equivalent of tobiwan) that announced a new pro team with legendary names people assumed it'd be Artstyle+PGG+Azen+whoever else isn't playing atm for a good team but used to be pro. Just rumors though. Also Artstyle would maybe have issues finding a sponsor considering the reason he left Na'Vi was because he didn't want to pay the cut from his TI1 winnings.
Anyway starts tomorrow, they announced the groups and shit already on
http://www.dota2.com/international/home/overview/. Group B looks a bit harder than group A but not by much, teams are fairly well spread out. Also they added a bo3 in loser bracket the rest is still bo1, so a bad group stage performance could be fairly disastrous and you really don't want to be falling down to loser bracket.