If Nikon's 18-300 has the same IQ as the 16-85, it will be excellent ( should be for $1000 ), but the Tamron 18-270 PZD is an absolutely superb value : excellent IQ, very efficient VR, min focus down to about 12 inches at 270mm, delightful bokeh, capable AF ( even at 270mm ).
Yes, it goes beyond f/5.6 to f/6.3 after about 100mm, but the light weight and compactness make the 18-270 an ideal one-lens travel or every-day solution, at a great price.
Nikon may find it tough to break into an already-existing market at this price, although I don't doubt that the quality will be there.
For any USA-based users considering a replacement x-10 sensor, here is the info :
Call 1-800-800-3854 / Fuji service
When you get the first prompt, Hit 1. When you get the next prompt, Hit 2.
They take your name and email address and will make contact when the new sensors arrive. The replacement offer extends to December 2013. The guys at that number are helpful, and aware of the huge furore re the orb issue.
RB - Thanks for this preview. Will the X10 go beyond f/8 or is that the smallest aperture ?Keith