Let's see how the Indian team can be managed. Vijay and Gambhir open, no doubt about that. One key issue is Raina. He's been the top batsman among the Indians in the IPL, second only to Sachin and Kallis, with four fifties and a strike rate over 120. Unfortunately, he's struggled repeatedly in T20Is, and those stats are not too encouraging. Even some sloggers in this team and around have done better. They need to tap that form and convert it into T20I form, and match wins, rather than worry too much about the short ball. All said and done, he's the best fielder in the team, and should be on the field for all 20 overs, not wasting one with the ball.
Raina's not the only form player. Rohit Sharma has often carried his team and scored big, and quick. Dhoni's exploits in the closing games are well-known, and he can tap that form into the World T20. Of course, he won't have Haydos, Albie, Murali and Dougie to fall back on here, but with the available resources, he should make it.
Yuvraj has struggled, but he's a class act, and should recover. Yusuf Pathan has been inconsistent in the IPL and struggled to notch up big scores, but that's still largesse in comparison to the batting contribution of the other bowlers- which is next to nothing. You can't go in with five of these bowlers at present. At seven, he can stretch the batting a long way and add some useful striking power, so he's not out of it.
The form bowlers are Harbhajan, Zaheer, and a little less so Nehra and Vinay Kumar. All four should make the starting XI. Yusuf can handle the balance overs, and maybe one over from one of the top six should surprise the batting. Alternatively, they could have had two specialist spinners in the XI, but Chawla's form doesn't inspire much confidence now, while better spinners have been overlooked. Except for Yuvraj, all of these players have had it good in the IPL, and the trick will be to tap their form.