Here is the ENGLISH TRANSLATION from the Spanish Website:
It was left to see the first EOS-1D Mark III with the new firmware 1.2.3 installed
Although not yet available publicly, several photographers have confirmed to QUESABESDE.COM that Canon has already begun the process of installing the new firmware 1.2.3 for the EOS-1D Mark III.
Theoretically aimed at improving the autofocus and sharpness of images, the renewed firmware also allows you to select the point of focus with the joystick back.
Although the new firmware for the EOS-1D Mark III has not yet seen the light of formal-sector sources claim that it will do so tomorrow on 30 - some photographers already have version 1.2.3 installed on your camera.
According to QUESABESDE.COM, this is the case with some professionals to Reuters, whose cameras have just returned from service with the new firmware installed.
© Eduardo Parra, QUESABESDE.COM
Some photographers have already shown their QUESABESDE.COM EOS-1D Mark III recently updated.
Even without any official confirmation about it, this version 1.2.3 appears to be the third firmware update for this range of professional SLR.
Rumors since their arrival earlier this year, ahead QUESABESDE.COM days ago this week Canon launch the new firmware with which it was intended to put an end to the problems of approach that this model has long drag and
even that had forced his way by the technical service.
While awaiting that Canon publish the official version of this new firmware and will publicise the list of improvements, this method has already been able to hear some of the innovations incorporated in this update.
For now, one of the developments that seem to have more acceptance among photographers is the ability to control the focus point of the camera from the joystick back. An option available on the EOS 5D, but until now was
not feasible in the EOS-1D Mark III.
In addition, some of the professionals has also consulted with QUESABESDE.COM shared his satisfaction to see some improvement in the sense of sharpness that can be seen in the first shots made after the upgrade.
Kudos to Wally Jarratt for this news.
EDIT: Anyone knows why this post was moved to rumours? This as far from a rumour as you can get and surely belongs in the "Canon EOS Digital Cameras" section.