In approximately 48 hours Nikon will announce the D610 camera. As I already mentioned, the D610 specs will be almost identical to the D600. The only known difference seems to be the improved fps rate (6 vs. 5.5) and a new weather sealing identical to the D800 (the D600 only had "extensive" weather sealing in "various points of the body"). The D610 will be made in Thailand (just like the D600).
I will try to have some basic D610 coverage next week.