The new handsets are the Sony Ericsson Mix Walkman and the Sony Ericsson txt pro.
Presented as a "music touch phone that truly focuses on entertainment", the Mix Walkman comes with a 3 inch (400 x 240) display, Four Corner Touch UI (similar to what you see on the Xperia Mini range), Wi-Fi, Facebook and Twitter integration, and a 3.2MP camera.
The Mix has a "cool karaoke mode", and a new feature called Zappin, which 'lets you browse through your songs in a fun way by automatically being served the chorus of the songs while skipping through them".
As its name suggests, the Sony Ericsson txt pro comes with a (sliding) QWERTY keyboard. Other than that, its internals are similar to what you find in the Mix Walkman.
Both the Mix Walkman and the txt pro will be available starting the third quarter of the year. Sony Ericsson didn't announce the handsets' prices, but they shouldn't be on the high side (especially since neither of the phones has 3G).
source: Unwired View