AT&T has expanded its buy one, get one free promotion to include the Galaxy S7 and S7 edge, and the carrier will extend the deal to the Galaxy S7 active once it becomes available. The terms and conditions of the BOGO deal for the Galaxy S7 mention the S7 active as being eligible for the promotion.

Galaxy S6 active

From AT&T (via SamMobile):

Eligible Devices: Includes new Samsung Galaxy S7, Note5, S6 32 GB (excludes 64 GB), S6 edge, S6 active 32 GB (excludes 64 GB), S7 edge & S7 active only (excludes Certified-Like New/Pre-owned) purch. on installment agmt. Priced up to $915/each (up to $30.50/mo.). Device retail price is divided into monthly installments. After all bill credits, get eligible device priced at up to $695 (up to $23.17/mo) for free. May apply max credit towards other eligible devices, which will be discounted but not free. Taxes on full retail prices due at sale.

The Galaxy S7 active is slated to make its debut on June 10, and like its predecessors, will be exclusive to AT&T. The leaks suggest we'll see a phone with a 5.1-inch QHD display, Snapdragon 820 SoC, and a 4000mAh battery. There's even a possibility of a "desert camo" edition.