Filed under: Cellphones, Portable VideoSo we know that AT&T slipped its MediaFLO-based mobile TV launch from the end of 2007 out to early '08, but just how "early" are we talking? Well, "as early as possible," to be specific. That rather unhelpful statement is all that's coming out of AT&T for the moment regarding its go-live window for the service, saying that testing is going "very, very well" but that it wanted to take an extra timeout to "make sure the user experience is absolutely optimal." As far as we're concerned, those sta