[notabadname]

Other than Apple making an announcement, nothing is "for sure". But with all the other evidence, most of which is very credible, it seems all but certain there will be an announcement of the new iPhone at the DC. But the announcement could be about a July release. I certainly would not buy a current iPhone, even if you found one, unless: 3G is not an issue for you, larger memory capacity is not an issue, and possibly (although I think this one is wishful thinking) GPS is not an issue.

The final answer though to your "how soon can I find out?" question is: When Apple announces it. Everything else, and I mean everything else, is just speculation.

The only other iPhone fact, because it came from Apple and Jobs, is that we will get a software update to 2.0 which will permit the use of 3rd Party Apps soon to be available at iTunes. That is next month. But that doesn't require a new iPhone to be released in June.