MacRumors and other sites just posted about an early release of the iPhone 2.0 software here.
While I can't say I recommend being an early adopter, I've just downloaded and installed it.
The new iPhone is about to be released (tomorrow). No, I don't know when I can get them. I'm at least as anxious as you are, I've got my credit card in my hand, ready to order one as soon as they turn up for sale.
(taps foot)
UPDATE: the AppleInsider is advising against updating at this time; with the new iPhone out today, users who update are having trouble getting the updated phones working. I suspect that'll be resolved shortly, but hold off and check for updates here.
Don't you already have an iPhone? You must really hate other people having newer gadgets than you. ;)
I'll be heading to the AT&T store bright and early tomorrow for their 8a opening; don't think they'll run out but I want to spend all day with my new toy. ^_^
My fave app so far (and I don't even have the phone yet)? PhoneSaber. Must get.
We don't get our hands on new gadgets til AFTER the public gets 'em. We were surprised to get our iPhones quickly after public release the first time.