The Nokia 5610 XpressMusic is headed to one or more mobile carriers soon as it just got FCC approval. Really it's the same as the 5310 but with a few upgrades.

On of those upgrades is in the camera, it’s received a full megapixel bump from 2MP to 3. The other major update comes in the battery as music playback has been bumped from 18 hours to 22 hours, which is pretty good, in fact that’s on par with most of the iPods out now.

It has a slider form factor unlike the 5310 and it has aluminum sides, and there is alos web 2.0 services access available on the device. Surely there are other upgrades, but those are all the major ones that are known, price is another thing we have no clue about, though it will probably be really close to whatever the 5310 is sitting at now, which is $300 unlocked right now.

Source (pdf) [FCC] via [mobilewhack]