The Buddh International Circuit is nothing if not dusty. While the track configuration should lend itself to overtaking, the lack of grip off-line is going to make it difficult to pass. A lot will depend on how the DRS zones, located on the start/finish straight and the long run to the Turn 4 right-hander, pan out.
Most likely, a driver is going to need to be ahead into the braking zone to make anything stick - and then hope that the dust picked up on their tyres doesn't cost them too much grip in the next few corners as they clean up. Unfortunately, a late-braking move up the inside will likely result only in running far too deep into the corner.