A T-Mobile teaser site is reporting the the mobile network is readying their first-ever HSPA+ devices.  More clues are now emerging from a T-Mobile microsite, rightfully named, "g2.t-mobile.com".

Previous rumors pointed to devices like the HTC Desire HD branded as the MyTouch HD and the HTC Vision as the G1 Blaze; both would be made available on T-Mobile's upcoming HSPA+ network.

Specifications are currently unknown for the network's G2 device, however it will be the first device on their upgraded HSPA+ network.  The rumored device will feature a slide-out QWERTY keypad, sport a 3.7″ touchscreen, a 1GHZ processor and a redesigned keypad with four rows of keys.

Currently the site says that "This site is temporarily unavailable while we work to improve the site. We'll be back soon, better than ever—so please check back later. Thanks for your patience."  Previously the teaser site said that "Later this year, the first HSPA+ smartphone from T-Mobile will shape the next generation. Yours," and offered a sign-up page for receiving information on the launch.

Evidently details and specifications aren't completely rolled out so consumers will have to remain at the edge of their seats for more developments in the coming weeks.