AT&T CEO Ralph de la Vega just confirmed at the D9 conference today that the carrier is "working on" a shared data plan, but he's not committing to a time frame just yet. He also left no doubts about those plans when pressed further on the question, clearly opening the door to a situation where you could have an iPad, an Atrix 4G, an AT&T netbook and just about anything else all sharing a unified pool of minutes and data. He didn't offer any hints about possible pricing, though, and it certainly sounds like this is something that's still a ways out from actually being launched.
AT&T confirms its 'working on' a shared data plan, won't commit to a time frame -- Engadget
This is huge news and is really a dramatic shift in how carriers are doing business. Yeah, VZW talked about doing something similar before, but a shared plan is even better than tethering (other than your PC probably doesn't have a 3G/LTE connection).
Exciting stuff. VZW will have to follow suit. Also a little scary. Most people may not realize how much data they would burn through on their PC or Tablet.