Okay, so it's not as big a news as the AF-S Nikkor 35mm f/1.4G ED we're all expecting in just over a weeks time (I'm guessing), but I never really liked the LF-1 rear lens cap - after all it doesn't seal that well and certainly could of been made to mate with the rubber gasket on the pro-Nikkors.
Anyhow, this site say the new cap is called the LF-4 (even I can work that out without using Google translator - it's in Japanese). I wonder what happened to the LF-2 and 3? Was one of those the slight amendment for non-English speakers with the Pac-Man type icon that replaced the word "Open"? Who cares? Anyway this looks like a substantial revision, and I wonder if it's made in green for use in the factory? The price is 378 yen, or around $5, which will end up as £5 in UK.
UPDATE 07/09/10: I now have a new AF-S Nikkor 55-300mm f/4.5-5.6 with the new LF-4, and while the rear cap doesn't seal with the rear rubber gasket, it covers more of the mount than the LF-1. It's also easier to grip and it certainly feels more secure when attached. Oh, and yeah, the other very welcome benefit, is that it now locks on the body cap (BF-1A and older BF-1 manual focus version), so they'll stay together in your camera bag (so you can loose both together, rather than one or the other). Now where is the rumored AF-S 35mm f/1.4G?