Here's why the Canon 4K strategy doesn't make sense to me:
http://www.eoshd.com/content/7927/the-downfall-of-the-big-guys-just-began-blackmagic-2-5k-cinema-camera-with-12bit-raw-for-3000
http://www.eoshd.com/content/7927/the-downfall-of-the-big-guys-just-began-blackmagic-2-5k-cinema-camera-with-12bit-raw-for-3000