http://www.nikonusa.com/Find-Your-Nikon ... F1.8G.html I'm guessing this is for the crowd that would be using the D400 which is rumored to be coming out shortly.
Also, in regards to this post, maybe this will be the lens that replaces my 50/1.8 for dark ride photography
What's most interesting is that this wasn't on the radar of any of the rumor sites...makes me wonder what else could be next!
I'm guessing either the 24 or 35/1.4G. Canon just updated their 24 recently. Nikon's old one on the used market catches more than the old retail price.
Last year I agonized between Canon and Nikon and finally went with Canon and bought a 40D. The D300 was around $500 more at the time, but with big release after big release I am starting to have Nikon envy!