Looks like we were lead astray by our AT&T mole. An alert reader dropped into the AT&T store and asked after the Tilt, which should have dropped today. Here’s what he found out:

I went to the AT&T store today to see if the ATT tilt was available
and was not surprised to see that it was not released yet. I found out
that the phone is scheduled to be released on September 25th, 2007;
however, that is only the scheduled release date the sales
representative stated that it may takes a few days longer, but should
be anywhere around Sept. 25 – October 1st at the most.

Thanks, LN!