I don't think it's any secret that Canon, Sony, and Pentax all have DSLR announcements centered around next month's PMA trade show. (And that would be a Digital Rebel III, 5D replacement, A300, and K20D at a minimum, for those who haven't been following the rumor mills.) The question has been whether Nikon has any such DSLR announcements pending. Maybe.
D40x production has apparently ceased in the Thailand factory. Before you read too much into that, you should know that production of various models are often juggled in interesting ways. Nikon will sometimes try to quickly build a large inventory of one of the models nearing the end of its life, then stop all production of that model to clear room for production of another model. The inventory build-up of the no-longer made model is then expected to last until the replacement is announced and ready. On the other hand, note that the same Nikon plant just increased D300 production at about the same time it stopped D40x production, so it's possible that Nikon is trying to juggle production to better match demand.
Nevertheless, it does appear that the D40x replacement is looming (I predicted one in my 2008 predictions) and may be about to enter production. Moreover, it appears that the DX equivalent of a 24-120mm lens has also entered production (that would be a 16-85mm f/3.5-5.6G VR DX AF-S for those who really want to know, and that's a ~24-128mm equivalent). Meanwhile, there are other rumblings going on in the lens department. It appears that Nikon intends to make some major reshuffling of the lens lineup in 2008 by dropping some old favorites (the 80-200mm f/2.8 is apparently no longer produced and inventories are running low, for example), updating others, and, of course, adding new ones like the 16-85mm DX.
The question is whether Nikon will use PMA to announce these and other new products (can you say Coolpix?) or let the others blow their horns on their own briefly.