We recently enabled Content ID scanning on channels identified as affiliates of MCNs [the networks/Multi Channel Networks]. This has resulted in new copyright claims for some users, based on policies set by the relevant content owners. As ever, channel owners can easily dispute Content ID claims if they believe those claims are invalid.
Bottom line: "managed" channels are safe and are exempt from any content ID claims as well as the upcoming monetization review changes detailed in the above link. "Affiliate" channels will continue to get content ID claims and will also be affected by the incoming monetization review system.
http://www.neogaf.com/forum/showthread.php?t=733129
http://www.tubefilter.com/2013/12/11/yo ... id-claims/
So basically, there might be very little game music, game reviews, first impressions or Let's Plays/Walkthroughs of games or other entertainment in general in the future. YouTube has lately become a bit of a minefield for ID claims, so...