I see what you're saying and am assuming that there is a Next charge that should show up at some point in time, but the fact is the strangeness noted above in the 1st post CHANGES depending on whether or not I've simply refreshed the web page.
On first viewing (of the browser session, any browser BTW) of my account Overview page, I get TWO plans showing up - one plan is totally unviewable (with an error message) the other plan shows only two of the three phones that should be there. When I simply refresh the page, however, the 1st plan disappears entirely and the "2nd" plan correctly shows the two dumbphones and one smartphone on the plan, though no Next information is displayed.
This is consistent incorrect behavior across browsers (Firefox/Explorer, etc) and, to my great relief, actually is the same incorrect behavior that two different customer reps saw when they accessed my account "as me" (however ATT reps do that).
The reps have a DIFFERENT account display than what a customer can access that showed them the account financial details were apparently all correct, however the customer-interface display was broken for them just like it was for me.
That is to say, this for sure is NOT a "billing cycle needs to catch up" problem; there is something seriously broken about ATT's web interface to customer accounts - based on other posts around here, it MIGHT have to do with recent web site interface changes and/or display of recently-changed accounts (as is mine - upgraded a line within the last month - pror to that the online pages looked fine).