haa haa haaaa... that was rich. sab kuchh hai?!!

IMO, they would have cut somewhere or the other. Most probably the kind of seat, AC option (speed, no. of blowers), interior plastic, claddings and such stuff. I think it is essentially a step to pull in more customers and as such may just be a simple renaming of the lower version (sienna=>Petra?) and then some price reduction.