UPDATE: looking at the translation again – I think it says “replaced with” instead of “replacement and”, so we are talking about one potential new lens here: AF-S 100-500mm f/4-5.6 IF-ED VR
This rumor is about a new lens from Nikon to be released in Spring 2010 (or around PMA):
NR rating system: 70%
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And one more rumor: a dpreview user keeps repeating (in several different threads) that two other lenses will be released with the expected Nikon AF-S Nikkor 16-35mm f/4G ED VR – an ultra wide prime lens and an extreme zoom tele lens.
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For your enjoyment (not a rumor): a rare Nikon light grey AF-S 28-70mm f/2.8D ED-IF lens currently for sale on eBay:
Update: yes, there was a 100-500mm lens rumor a while ago. Here is the banner: