Just a thought,but it's starting to appear that the world motorcycle markets are approaching a point of equilibrium. As soon as all markets require the same in noise and polution standards, there would be no point to introduce new models at different times due to differences in required technology. Right now, Europe is the largest market for M/C's. Probably, the cost of petrol is a major factor in the number of owners/riders there, ergo: they get the new stuff first.
I note that the US is tending towards California standards, which is very close to current Euro standards for allowable hydrocarbon emissions.
As we approach equilibrium, there will be less and less differences and thus, easier on the world's manufacturers to produce a single model, eg, the Honda Pan European vs the Honda ST1300. From my viewpoint, it's something for us Americans (and others) to look forward to.