The Internet Is Freaking Out About A Half Life Update

This morning Half Life 2: Episode 2 updated along with most of the other games that were developed by Valve. The official reason for this update was to add Big Picture support to Valve's different games. But then why was Half Life 2's update nearly 300MB bigger than every other update? That's the question on everyone's mind. And things get even more complicated when you involve the cryptic video posted below.