Canon 5DX Feb 28

So the rumors goes. And crippled video too boot.

http://www.kuaddro.com/the-new-canon-eos-5d-mk-iii-wil-be-announced-on-february-28/

I'm sure they will have it at NAB. We'll see what it really is all about.
Canon won't kill potential sales with the C300 so my guess is it won't have less Moir or jello or good audio etc....

Oh those rumor mills keep churning them out.
http://www.canonrumors.com/2012/02/5d-x-or-mark-iii-specs-release-date-cr1/

No 1080 60p, no increase in bandwidth, bigger sensor with worse low light shooting.