mention1,
They haven't even announced JNB, let alone what time they'll get there!
They'll also be flying through PER if they want to do it... So will your wife be happy to put a SYD - JNB customer on a flight that takes 3 hours longer and has a stop? The QF flight leaves at 10:30 so even if the Voz flight took off at morning curfew, it would still only make it to JNB a max of 1 hour before, if not arrive later!
My point here is not to say Qantas are great and I think it is good V is in the market. It is that Virgin are masters of hype and marketing, and its best not to believe everything they say, because when it comes down to it, airlines are airlines and there are limits on what they can actually achieve.
A little bit of competition is always healthy, but I'd hate to see people thinking that they are the saviour when they end up flying the same routes for the same fares as Qantas, but 10 minutes apart.