From the Source: Square-Enix - 2015 Holiday Surprise Box! WTF is this?

"What will be in the box? Heck if I know... but if you get your hands on it... you will find out." :p

        Square Enix
The 2015 Holiday Surprise Box from Square Enix
The 2015 Holiday Surprise Box [PC DOWNLOAD]For just $9.99, you will receive a surprise selection of our most exciting PC digital games worth over $80!

Stuffed with 5 games, this is one holiday treat you just can’t pass up!

The contents of this exclusive deal will be announced and delivered after 12:00pm on December 18th, 2015.

Offer Valid: 12/8/2015 12:00am PST ~ 12/17/2015 11: 59pm PST

More information can be found at the Square Enix store here: