EA and Dice have confirmed Battlefield 2142:

Today we have some really big news to share with you. The more sniper-eyed of you out there will probably already know, but we're currently hard at work developing "Battlefield 2142", which is scheduled for release this Autumn. As you'll have guessed, this is a departure for the BF series as we're going into the future - something that a lot of you wanted to see happen in the BF universe. We're creating a ton of cool features that you won't have seen in any BF before, including cloaking devices, mines that follow you, awesome new rifles, guns and grenades, and of course, MECHS! We're developing this here in DICE Stockholm while the DICE Canada studio will be hard at work on a 1.3 update for Battlefield 2, as well as the Armoured Fury Booster Pack.

There's a low quality trailer which sets the scene and shows off some of the footage. A formal press release is due later today so stay tuned.