Although the Department of Homeland Security selected the compact variant of the SIG P320 early this year, it was kept quiet.
Initially, there was the matter of a Government Accounting Office protest to wait on. That cleared up fairly quickly, but still the Department has kept mum on the subject despite an announcement via InSight, their internal news system. This screenshot originated on pistol-forum.com.

Currently, the P320C is in First Article Testing, a process which ensures production models will meet the same government requirements as the prototypes did during the solicitation.
This is the pistol they selected, as seen at AUSA.

Of the commercial P320 line, the DHS pistol is closest to the closest to the X Carry. Additionally, each fielded firearm comes with eight magazines, a cleaning kit, parts to support use out to 10K rounds, HD sights, training, manuals and cable lock, as per the contract.
www.sigsauer.com/products/firearms/pistols/p320