Besides the F700 Samsung also shows several other phones in their F-series. Some of which we already know like the F300 and F500. The Samsung F520 is new though, featuring a two-way sliding mechanism with a QWERTY keyboard.

The Samsung F520 features a 3 inch screen, a 3MP camera, Bluetooth, music player, video player, full HTML browser and microSD card slot. The HSDPA and EDGE enabled smartphone has a music and video player and measures 104.8x53.7x17.4mm.
Mobile Burn has a couple of real-world photos of the Samsung F520.
For more details on the F520 see this Samsung press-release.