The Nikon users will want to see some improvements on the (already) old 80-400mm/4.5-5.6 telephoto zoom will probably be satisfied soon.
Nikon recently issued two patents (1 & 2) for a zoom in this category. It does not tell us when it will be available, but according to the yellow brand habits, the end of the year 2012 or the beginning of the year 2013 seems quite probable (while we are still waiting fro similar indications from Canon and while Sony is quite happy with the exceptional 70-400mm of its G range).
