So far our Sigma rumors and leaks have been very reliable. Now one of our Sigma sources told us this:
Sigma and Nikon are very good partners. And according to indirect info he got the new Sigma lenses designed for Full Frame mirrorless will be launched for two systems: The Sony FE and the new Nikon FF mirrorless.
According to latest rumors Sigma might show their first Full Frame lenses for mirrorless system cameras at the Cp+ show which starts on March 1. Don’t know if that also means that Nikon will launch their first camera at CP+ too.