I've just spotted teh rumored nikkor 18-300 on polish nikon site. No info on price or availability though.
EDIT link: http://www.nikon.pl/pl_PL/products/product_details.page?ParamValue=NIKKOR%20Lenses&Subnav1Param=Auto%20Focus%20Lenses&Subnav2Param=DX&Subnav3Param=0&RunQuery=l3&ID=1848117
Below a summary of what's listed there:
DX format 16.7x zoom lens with versatile 18-300mm focal range (FX/35mm equivalent:27 to 450mm)
Vibration Reduction II (VR II) stabilization system enables more flexible hand-held shooting and lets you use shutter speeds that are up to 4 stops slower.
Maximum aperture of f/5.6 at the telephoto end of the range.
Zoom-lock switch keeps the lens secure when not in use.
9-blade rounded diaphragm opening makes out-of-focus elements blend together smoothly.
Three ED glass and three aspherical lens elements ensure high resolution and superior contrast.
SWM (Silent Wave Motor) for fast, whisper-quiet autofocus.
Compact and lightweight design for a lens with this range.
And a couple of technical specs:
Focal length 18-300 mm
Maximum aperture f/3.5-5.6
Minimum aperture f/22-32
Lens construction 19 elements in 14 groups (including 3 aspherical lens elements and 3 ED lens elements)
Angle of view 76 °-5 °20 '
Focusing Nikon Internal Focusing (IF) System with autofocus controlled by Silent Wave Motor and separate focus ring for manual focus
Minimum focus distance 300 mm focal length: 0.45 m (1.48 ft) from focal plane
Maximum reproduction ratio 1/3.2x
No. of diaphragm blades 9 (rounded diaphragm opening)
Filter-attachment size 77 mm (P=0.75 mm)
Dimensions Approx. 83 mm diameter x 120 mm (distance from camera lens mount flange)
Weight Approx. 830 g (29.3 oz)