Right now the only new aircraft type seems to be a few ATR-42s for new start up Air Deccan and the seven CRJs which Air Sahara has already started flying (ex Midway/flyBE).
The 737NGs have ben around for years, way back from 1999 or even earlier for Jet Airways.
And as per the local regulator's rulls (please see the other Jet Airways posting on this board a couple of weeks back) once there are sufficient trained pilots, out goes the expat pilots!(no offence intended in language).
Hope this of some help
Cheers