Thanks to a leaked AT&T rebate sheet, we now have the confirmation that the largest North American GSM carrier will release the following phones: Motorola QA1 Karma, Sony Ericsson C905a and Samsung Jack i637.

Appeared over at BGR, the rebate sheet doesn’t disclose the exact release dates of said phones, but we know they should come to AT&T between May 11 and June 21 (just like the Samsung a177, also unveiled today).

Anyway, let us remind you what these upcoming devices are all about.

Motorola QA1 Karma is a slider that we first saw back in February, alongside the Moto QA4. It has a full QWERTY keyboard, 3G and a landscape display – probably with 240 x 320 pixels:

Sony Ericsson C905a is rumored to hit AT&T since last year, and I’m sure you already know that it’s a Cyber-shot phone featuring 3G, Wi-Fi and an 8MP autofocus camera with Xenon flash:

As a side note, the C905a will also hit T-Mobile, under the name of Sony Ericsson CS8.

Last but not least, Samsung Jack i637 is a Windows Mobile smartphone that we don’t have an image of yet, save for this sketch from FCC:

The features of i637 include HSDPA connectivity, Wi-Fi and Bluetooth.