With the world cup fast approaching the tr-series is a great opportunity for India to experiment as well as rest some of the regulars. Sachin should be back, fitness permitting. Given the nature of the pitches in the WI, a leg spinner (Piyush Chawla) might be worth a try. Yuvraj Singh and Pathan could use a rest.
The allrounder spot is wide open especially given the run of poor form from Pathan. Romesh Powar or RS Sodhi might be possible candidates to fill the slot. A new fast bowler who can bat should be a welcome addition. Opening the bowling with Munaf and Sreesanth weakens the batting quite a bit.
India might be better off going in with Agarkar, Sreesanth (or Munaf), Bhajji, Powar and Chawla for the bowling while Sachin, Viru, Dravid, Kaif, Raina (or Sodhi or another all rounder medium pacer like JP Yadav) make up the batting along with Dhoni.