AT&T usually gets the best phones first, and again they will get the Samsung Galaxy S6 Active. The Galaxy S6 does not carry on the tradition of being dust-proof and water-resistant like the Galaxy S5, as Samsung focused more on quality materials rather than durability. The Galaxy S6 has a metal frame with a glass front and back, similar to the Sony Xperia Z3, thus leaving is prone to the elements. The S5 was made mostly out of plastic with exception for the screen, and many reviewers focused on that as their main complaint.
According to Sammobile.com, AT&T will carry the Galaxy S6 Active(SM-G890A) which will be water-resistant and dust-proof. All of the internals will remain the same, with the exception of a larger battery(3500mAh.)