Here is my translation of the Google Japanese-to-English translation of this announcement:
To customers using Digital Photo Professional version 3.11.10 with the Canon EOS 5D Mark III Digital SLR camera
April 5, 2012
We thank you very much for your patronage of Canon products.
It has been confirmed that the RAW development process used by Digital Photo Professional version 3.11.10 is not appropriate, generating somewhat blurred images. This is the version of DPP that is included on the CD in the Canon EOS 5D Mark III Digital SLR box.
<Canon deeply apologizes>
When Canon EOS 5D Mark III RAW images are processed by DPP version 3.11.10, generated images become somewhat blurred.
Canon Digital Photo Professional RAW Development Software version 3.11.10 included in the Canon EOS 5D Mark III box.
This problem will not be observed in other cameras.
<Actually, the Canon PowerShot G1 X is also affected.>
An update to the Digital Photo Pro software is expected to be published in mid-April.