A customer service manager at Cingular (we called 800-947-5096 and were transferred to sales) gave us that date late Thursday, but, alas, said he didn't have any additional information beyond that.
Sounds like a similar story to what we've heard on this forum: calling or stopping by a Cingular store and being told the "for sure" date. This could very well be the date but so could the others.
And this could be the date when the date will be announced rather than when it's actually available.