How are those four teams decided, or which are those four teams? There aren't any divisions I suppose.
Each team owner was asked to pick up some colored balls during the auction and the divisions were decided on the basis of the ball picked up by the respective team owners.
10 teams are divided into 2 groups of 5 each. Each team plays twice against the 4 teams in it's group and also with 1 team from the other group. Then they play just once against the remaining 4.
(5*2 + 4 = 14).
The groups are:
Group A: Deccan Chargers, Delhi Daredevils, Kings XI Punjab, Mumbai Indians and Pune Warriors India
Group B: Kolkata Knight Riders, Kochi Tuskers Kerala, Royal Challengers Bangalore, Rajasthan Royals and Chennai Super Kings.