AT&T today announced plans to introduce three new Windows Phones 7.5 based smartphones including HTC Titan, Samsung Focus S and Samsung Focus Flash in fourth quarter of this year. AT&T described the three handsets as follows:

• Samsung Focus S: The Samsung Focus S builds on the success of the award-winning and highest selling Windows Phone in the U.S., the Samsung Focus. Featuring a 4.3-inch Super AMOLED Plus display, 1.4GHz processor, 4G-capable speeds and a thin profile at 8.55 millimeters. It includes front facing 1.3-megapixel and a rear facing 8-megapixel cameras. The Samsung Focus S will find its way into a lot of pockets this fall.
• HTC Titan: Debuting as the largest screen in AT&T’s smartphone portfolio at 4.7 inches, HTC Titan fits comfortably in the palm of your hand. Watch video from AT&T U-Verse Mobile or play Xbox LIVE games on the largest screen yet for a Windows Phone. Running a 1.5 GHz processor and an 8-megapixel camera with dual LED flash, HTC Titan will feed the senses.
• Samsung Focus Flash: Designed to hit the market packed with value, Samsung Focus Flash’s 3.7-inch Super AMOLED screen will both fit in pockets and be light on pocketbooks with the full power of Windows Phone 7.5 inside. As fast and lightweight as it is compact, it runs a 1.4 GHz processor and a 5-megapixel camera plus front facing camera.

Along with the new handsets, AT&T also announced that all the previous generation Windows Phone handset including HTC HD7S, HTC Surround, LG Quantum and Samsung Focus would get Windows Phone 7.5 Mango update. AT&T didn’t give exact launch date or pricing for the new Windows Phones.