if the fight reached the last round again then we can say he will win the fight because Floyd is the boss on Las Vegas. Pacquiao needs to knock him out this time so he cannot let the Judge take advantage of the decision.
The last fight of Mayweather was in Asia, in Japan(Tokyo) so FMW can obviously come to Asia... And since the first fight took place in America(Las Vegas), it would be fair for the rematch to take place in Asia IMHO.