Rumored Nikon AF-S Nikkor 10-18mm f/4 G ED NNikon Rumors (among others) has a posting about a rumored Nikon 10-18mm f4 lens.
If this ain't just a rumor, it would mean that a full Nikon transition can take place, because it could replace my Sigma 10-20mm lens... 'Could', if the price ain't too high (<1000 euro's).