Hmm... It seems they will use the 737-800 for all their longhaul. 6hours in a 738 in Y is tough. OS offers this service VIE-DXB and reports are not good.
On the the other hand, SQ has just asked for 212 connections into India ex-SIN (current:52) and thrown the indian side completely. So don"t think SQ is going to take this new "lets fly indians to SIN" trend hands down.