Steam News has
word of a new minor update to the content delivery system. According to the
accompanying post, the program will be patched on a weekly basis now, with the
scheduled updates to take place every Wednesday at 10:00 p.m. EST (7:00 p.m.
PST). Thanks Frans.
As I understand it it was intentional for steam to deliver frequent patches as part of the anti cheat functionality, but since theres no word that this is what these patches are for or not who knows.