Sony had already suggested that their next handheld device, the NGP, might only launch in one territory this year but, according to Jack Tretton, the Japanese earthquake and the delays that resulted from it may be "the straw that says ‘maybe we get to just one market by the end of the year.'"
Apparently, as a result of the earthquake, many production processes were delayed, making all the more likely we won't see the NGP in Australia until early 2012.
At this stage it's impossible to say for sure which region is being prioritised although, considering the PSP's past success and its love of handheld gaming, we would probably suggest that region would be Japan. Whichever region is chosen, Australia and Europe are most likely at the bottom of that list.
More news as we get it.