Don't know how much of this rumor has been disgused, but every since hearing about somebody spotting a heavier version beingh tested in a post yesterday I thought I would search around and find what rumors exist.
In another article in this months Truck Trend magazine that I picked up today, they confirmed that it was reported in a trade paper in Japan that Nissan has signed a deal with Navistar(who makes Fords diesel) to produce a small diesel for an upcoming Titan 1/2 ton and are saying the new engine may presumably be a V6 turbodiesel. Trucktrend is saying that it is likely a 2010 release as is the new Altima diesel.