Bad news: The Canon EF 500mm f/4.0 L IS II USM Lens, Canon EF 600mm f/4.0 L IS II USM Lens, and Canon EF 200-400mm f/4L IS USM Ext 1.4x Lens have been delayed indefinitely. Here is my translation with Google's help:
EOS Series Lens release date change information
Thank you for your patronage.
The release date on the announced EOS lenses listed below have been changed.
Summary of Changes
Product Name | Planned Release Date | New Release Date |
Canon EF 500mm f/4.0 L IS II USM Lens | 2011 | Unknown * |
Canon EF 600mm f/4.0 L IS II USM Lens | 2011 | Unknown * |
The Canon EF 200-400mm f/4L IS USM Ext 1.4x Lens was originally expected to be (formally) announced on February 07, 2011 and scheduled for release later this year. This launch has also been delayed indefinitely. A release date for this lens will be announced when it is known.
We appologize for the inconvenience caused by these delays and will continue to make every effort to launch the new lenses. We look forward to your continued patronage.
Hopefully I didn't damage that announcement translation too badly (thanks Kaz).