North America - I think the gap is only going to increase this year especially since the PS3 really doesn't have an exclusive that is a guaranteed multi-million seller like Halo 3 or Super Mario Galaxy. I even think long term doesn't look good for the PS3 either because every month it does poorly is another month in which third parties starting new games will not make them PS3 exclusive unless offered a payout by Sony. So the list of third part PS3 exclusives might almost dry up in the next 1-3 years.
Europe - Who could have predicted that the 360 would be outselling the PS3 there? If current trends continue it'll be bad for the PS3 and put it into the same position it's in in North America.
Japan - The only real chance the PS3 has in the next few month to even attempt to close the gap WW on the 360. Unfortunately if current trends continue it might not be enough to even keep the gap from widening greatly.
So my prediction on when it will catch up Worldwide? At least 2 years depending on how Japan sales go. If sales don't pick up *a lot* in Japan then it will never surpass the 360 Worldwide.
