It goes on sale March 16th worldwide, along side the iPad 2 which gets a new cheaper price as the 'low end' version. The naming ditches the numbering system, following suit of their iPods and iMacs, which makes more sense really, distinguishing models with generation and year. I am so tempted. Don't be surprised if you see it on my PURCHASES Page soon.
Other announcements at yesterday's event from San Francisco included new Apple TV with 1080p HD support, iTunes 10.6 equipped with full iCloud features, and Japanese Siri. Cool.