On Major Nelsons latest Show, he had BIGVIP from the Xbox PR team on to talk about the upcoming dashboard update. Towards the end of the interview they discussed the Xbox Live Vision Camera. During this portion, he mentioned a release dates. It turns out that the dates discussed in the show are incorrect.
The (current) dates the Xbox Live Vision Camera are scheduled to be released are:
North America: September 19th
Europe and Asia (except Japan): October 2
Japan, Australia and New Zealand don't have confirmed dates yet.