Well this is interesting - Bloomberg reports that the U.S. Department of Justice is suing to block the merger of AT&T and T-Mobile, stating that it would "substantially lessen competition" in the wireless market. The DOJ is stating that the deal violates anti-trust regulations.
Most observers assumed, given the relatively lax oversight environment that permitted the merger of Comcast and Universal, that the AT&T-T-Mobile deal was a fait accompli. Should the deal be blocked, AT&T will have to pay T-Mobile $3B in cash and provide wireless spectrum and reduced costs on network calls for a total of $7B in concessions. Given the large amount of money AT&T would have to give up it's likely they will mount a vigorous legal defense.
Update: Here is a link to the DOJ press release. And here's Engadget's report on AT&T's (as well as Sprint's) response.
