I guess many of us were waiting for this: the possibility to use Sigma's excellent…
Canon Wants You to Upgrade to the EOS-1D X, or EOS 5D Mark III at Least
Stepping Up to a Canon EOS-1D X Digital SLR Camera
CanonUSA on YouTube posted two videos highlighting the features and advantages of the EOS-1D X, and especially wants you to upgrade to the EOS 5D Mark III :-)
EOS-1D X price check: B&H Photo, Adorama, Amazon USA, Amazon Canada, Canon Canada, Canon USA
EOS 5D Mark III price check: B&H Photo, Adorama, Amazon USA, Amazon Canada, Canon Canada, Canon USA