Apple sent the following message to various analysts and members of the media - "Please join us to learn about the iPhone software roadmap, including the iPhone SDK and some exciting new enterprise features.", inviting them at the "Town Hall" of the company's Cupertino campus, at 10A.M. Pacific time. In the same location, thy introduced the Intel-based Mac mini and Hi-Fi iPod back in February, 2006, as well as the aluminum iMacs, last August.
Other than the above, there's nothing else to say. In fact, since only a handful of people were invited, the rest of us will have to wait until 6th of March, afternoon, so we can get a clear view of what happened. Until then, my guess is we'll see the iPhone SDK before the 13th of March. What's yours?