Canon USA Announces EF 300mm, 400mm, 500mm and 600mm L IS II Lens Firmware Version 1.1.1

This just in from Canon USA:
 
To the Users of the EF300mm f/2.8L IS II USM, EF400mm f/2.8L IS II USM, EF500mm f/4L IS II USM, and EF600mm f/4L IS II USM Interchangeable Lenses for Canon Digital SLR Cameras
 
Thank you for using Canon products.
 
Canon has released a firmware update for EF300mm f/2.8L IS II USM, EF400mm F2.8L IS II USM, EF500mm f/4L IS II USM and EF600mm f/4L IS II USM lenses. This firmware update will be performed by Canon Service Centers. Please contact us using the contact information listed at the bottom of this page.
 
Firmware changes:
 
Firmware Version 1.1.1 incorporates the following enhancement:
 
1. Changes the control algorithm of the focus drive, and enhances the drive’s responsiveness for more precise focus and adjustments. In particular, the new firmware enhances the AI servo AF capability of the lenses to track objects that move irregularly in sports events, such as soccer or rugby.
 
Affected Products:
 
Firmware Version 1.1.1 is for lenses with Firmware Version 1.0.0. If the lens’ firmware is already Version 1.1.1, it is not necessary to update the firmware. The serial numbers (10 digits) of the lenses equipped with Firmware Version 1.0.0 are as follows:
 
EF300mm f/2.8L IS II USM:
 
The third digit in the serial number is either 0, 1, 2, or 3 (xx0xxxxxxx, xx1xxxxxxx, xx2xxxxxxx, xx3xxxxxxx).
 
EF400mm f/2.8L IS II USM:
 
The third digit in the serial number is either 0, 1, 2, or 3 (xx0xxxxxxx, xx1xxxxxxx, xx2xxxxxxx, xx3xxxxxxx).
 
EF500mm f/4L IS II USM
 
The third digit in the serial number is 0 (xx0xxxxxxx).
 
EF600mm f/4L IS II USM
 
The third digit in the serial number is 0 (xx0xxxxxxx).
 
Lenses with serial numbers other than those listed above are equipped with Firmware Version 1.1.1 or later.
 
Support
 
This information is for residents of the United States and Puerto Rico only. If you do not reside in the USA or Puerto Rico, please contact the Canon Customer Support Center in your region.
 
Please register your EF300mm f/2.8L IS II USM, EF400mm f/2.8L IS II USM, EF500mm f/4L IS II USM or EF600mm f/4L IS II USM. By registering, we will be able to notify you via email when future firmware updates become available.
 
Thank you,
Customer Support Operations
Canon U.S.A., Inc
 
Contact Information for Inquiries
Canon Customer Support Center
Phone: 1-800-OK-CANON 1-800-652-2666
TDD: 1-866-251-3752
Email: carecenter@cits.canon.com
For additional support options: www.usa.canon.com/support