Poll closed now. Not a big sample, but probably reasonably representative of MacRumors membership. the ratios have not changed much since the first couple of days.
About 60% North American, with nearly half the rest from Europe or thereabouts, nearly a quarter from Australasia, and the remainder scattered around the world.
It is not really surprising that there was no response from Oceania and polar regions. Internet services to those remote parts are relatively limited.
It is surprising that there was no response from East Asia. Along with South East Asia, there are some highly connected countries in the region. Perhaps language is a limitation, or maybe the tone of the forum is too US centric for their taste. Possibly the same reasons for the lack of response from the Middle East and the South Asian sub-continent.