A source is nearly positive Canon will be releasing this for Photokina.
70-300 f/4.5-5.6 IS II?
As we reported before, the current version was heavily backordered. A local store has had 3 on order for nearly 2 months. One has been shipped, the other 2 have not yet.
This sort of backorder behavior has lead to replacements in the past.
Other significant backorders?
In Canada, 5D Mark II kits with 24-105 f/4L IS lenses have been backordered for over a month with some retailers.
A lot of retailer info has been coming in globally about 5D Mark II shortages. There could be manufacturing reasons for this, as we expect at least 2 new camera bodies for Photokina and perhaps a 3rd in Q4 2010.
I've also had 52mm drop-in filters for supertelephotos on backorder for nearly 2 months. Replacement! :)