[Update: Yep, it was the DLC that already was announced. Apparently Microsoft pulled the trigger early on the add-ons.]
Konami Digital Entertainment, Inc. announces that a new update for METAL GEAR SOLID V: The Phantom Pain is now available across all platforms – PlayStation®4, PlayStation®3, Xbox One, Xbox 360 and PC. The new update includes seven DLC costumes and the Costume & Tack Pack bundle.
So yeah, if that Mother Base “insurance” DLC wasn’t enough, you can now spend more money on costumes for an undisclosed amount of cash. After we’re done doing Konami’s job for it we’ll post more information, I assume they’re the costumes they already announced.