AT&T has let us know this morning that the 3G MicroCell site revealed last night is currently supporting a "public trial" in Charlotte, North Carolina alone -- and perhaps more importantly, pricing (including that $20 unlimited, we presume) is being considered a part of that trial. Unfortunately, they've got "no other announcements to make at this time," so it's anyone's guess when this will wrap up and the rest of the country can get its hands on some "more bars in your places" (to quote the MicroCell's perky introductory videos). We'll update you as soon a