Från Canon Roumurs:
well, almost everyone.
The following firmware is said to update these cameras to work with the WFT-E2 II.
The 5D Mark II gets an added fix, see the note.
1D Mark III: http://web.canon.jp/imaging/eos1dm3/firmware.html
5D Mark II: http://web.canon.jp/imaging/eosd/firm-e/eos5dmk2/firmware.html
*note: Corrects a phenomenon in which visible noise may appear in images taken by continuous Bulb shooting.
I’m not sure if anyone has ever confirmed a Canon firmware update to include undisclosed tweaks and fixes. Anyone know for sure?
(Via Canon Rumors.)