At 10:00 Pacific / 1:00 Eastern today, Apple will host an event in San Francisco at which the next version of the iPad will be announced. I suspect that Apple will also announce when iOS 4.3 will be available, and it is also likely that Apple will preview the next major revision of the iOS, perhaps called iOS 5.0. I doubt we will learn much about new iPhone hardware, but who knows.
If you want to follow the event live as it happens, I recommend the live blogs at the following locations:
If you want to watch the event yourself but are not a member of the press with an invitation, I suspect that tonight, Apple will also provide a video of the event on the Apple website.
It will be great fun to see what Apple announces!
Picture from Macworld.com