Today Samsung and T-Mobile announced the availability of the new Samsung Katalyst.

The Samsung Katalyst (SGH-t739) is a slider-style GSM phone supporting the T-Mobile HotSpot @Home service.

The Wi-Fi enabled cell phone can be used to make calls from home over the wireless network or in one of the 8,500 T-Mobile hotspots nation-wide.
Other features of the Samsung Katalyst include 1.3MP camera, screen with 176x220px resolution, Bluetooth, microSD card slot, voice commands, music player T-Mobile myFaves, and Instant messaging (AOL, ICQ, Yahoo!, and Windows Live).

The measurements of the Quadband GSM/GPRS/EDGE mobile phone are 3.97" x 1.98" x .65". Photo via Crave.
T-Mobile did not disclose the price of the Samsung Katalyst yet and did not list it on their site yet.