While you wait, you can peruse the release notes for Xcode and for Interface Builder. Never hurts to read the documentation. Have a good weekend, all you iPhone coders!
P.S. One of our loyal tipsters, PJ, noted that he sent us an email about 36 hours ago with his surmise (based on a link he saw, behind the Apple developer site login wall, to a Beta 1 -> Beta 2 diffs manifest) that the revised iPhone SDK might be imminent. PJ, for the record, you guessed right.
Thanks Nik + PJ