Nikon has recalled a number of EN-EL3 batteries (used in the D50, D70, and D100). See the Nikon Web site for details on how to tell if your battery is one of the affected ones. Nikon is making this recall in response to four incidents where the battery has short circuited and overheated. Nikon advises you to stop using affected batteries immediately, and return them to Nikon for replacement.
The D2hs and D2x get a firmware update to version 1.01. The update enhances auto focus, corrects a bug with AF assist using certain Speedlights, improves flash performance, and corrects a bug in setting manual white balance.