Sony Ericsson just kicked out the K618, a new UMTS handset that they're touting as being as "light and slim as a typical 2.5G phone".
Which probably makes tons of sense to the average consumer.
Anyway, besides UMTS the K618 has a 1.9-inch, 176 x 220 pixel LCD screen, a 2.0 megapixel digital camera, and Bluetooth EDR (and support for A2DP, which means you can use it with stereo Bluetooth headphones).