Check out Engadget's live blog of the Canon event, complete with the specs.
Not to be outdone, Red released their new Scarlet camera:
The Scarlet camera specs are very similar to the Canon C300, but at a much lower price point ($13k). Check out the specs on the Nofilmschool site.
Oh yeah, and Redrock Micro released their new cage specifically for the Canon C300, and a universal cage for regular HDSLRs (The ultraCAGE):
Cinematography wizard, Philip Bloom, gives his updated take on the two cameras HERE.