HTC One mini (http://www.gsmarena.com/htc_one_mini-5505.php) has gone official (http://www.gsmarena.com/htc_one_mini_goes_official_with_43_720p_screen_dualcore_krait-news-6405.php) nearly two weeks ago with 4.3" 720p display, dual-core Snapdragon 400 chipset and 4MP UltraPixel camera. Its international rollout is scheduled to happen this September.
So far there is no official information on the AT&T's availability, but we have already seen a few blurry leaks of One minis with AT&T logos. Today's pic though is a solid proof that the AT&T version of HTC One mini exists and will probably go official soon.
(http://cdn.gsmarena.com/vv/newsimg/13/07/htc-one-mini-att-press-leak/gsmarena_001.jpg)
There is no differences design and specs-wise, save for the additional AT&T logo at the back. We guess AT&T announcement of the HTC One mini should be just around the corner. Meanwhile you are welcomed to check our preview (http://www.gsmarena.com/htc_one_mini-review-954.php) of the device.
Source (http://www.androidpolice.com/2013/07/27/heres-the-first-press-shot-of-atts-htc-one-mini/)
GSMArena.com