If you thought you’d seen the last of Windows Mobile 6.5 smartphone debuts – think again.  On Thursday, Verizon Wireless will release the LG Fathom, a new Windows Mobile slider.

We haven’t seen much WinMo action from LG of late, but we hear the company is planning big things for Windows Phone 7.  If you’re in the market for a WM6.5.3 Pro smartphone, here are the details:

The LG Fathom has a 3.2-inch 480×800 touchscreen, a slide-to-hide QWERTY keyboard, a 1GHz processor (make/model unknown) 256MB of RAM, GPS, 802.11b/g/n Wi-Fi, EV-DO Rev. A mobile broadband, a microSDHC memory card slot and a 3.5MP camera.  International travelers will also appreciate the Fathom’s built-in GSM/UMTS transceiver for use outside the U.S.

Verizon Wireless will roll out the Fathom first through business sales channels on May 27, with wider availability slated for June 3.