You can preorder it now at BHphoto and Adorama. Nikon also announced a special Z6 filmmaker kit you can buy now at BHphoto and Adorama:

The new 3 Legged Thing Zelda Dedicated L-Bracket for Nikon Z Series has been announced. Full details here: 3leggedthing.com/zelda

via CameraJabber

The new lens specs and pricing should be officially announced in January. And in the meantime some stores like for example kamera-express are already taking deposits to get you on top of the preorder list.

Dpreview made a list of things Nikon has to improve in 2019:

Nikon, you’re getting there. You launched the Z-mount with a bang in 2018, but despite its high-end pricing you must have known that the flagship Z7 wouldn’t be quite enough to tempt professionals and enthusiasts away from their D850 and D5 bodies. Don’t let the haters get you down, though. Keep up the pace and turn the Z mount into the professional system that we know it can be. We’re rooting for you.

Nikon – in 2019 we wish you would…

-Keep developing that Z-series lens roadmap.
-Bring 3D AF Tracking to the Z-series – in fact, bring all of your industry-leading AF area modes to the Z-series.
-Make an FTZ adapter with a built-in AF motor. Carey’s got a 105mm F2 DC he really wants to shoot with.
-Make the Z mount an open standard.

Press text:

KIPON released MTF curve&sample photos for new ELEGANT series lenses

time：2018-12-11 15:22:48　Views：122

KIPON released MTF curve and sample photos for new Elegant series lenses for Nikon Z mount and Canon R mount cameras,the optic system with IBERIT series,mixture of classic and modern design,photographers can get strong classic and modern feeling from these lenses,for processing quality,current days only very limited lens manufacture would like to develop these kind of lenses,even only want photographers get smooth focus feeling,we intergrated German&Swiss precision bearing into the lens design.For optic performance,on Fullframe sensor,or Apsc sensor,both result are very good.Attached some straight out sample photos taken by Nikon Z7, Canon R, also attached some sample photos by Fuji X mount Apsc camera, 24mm MTF f2.4 24mm MTF f4 24mm MTF f5.6 35mm MTF f2.4 35mm MTF f4 35mm MTF f5.6 50mm MTF f2.4 50mm MTF f4 50mm MTF f5.6 75mm MTF f2.4 75mm MTF f4 75mm MTF f5.6 90mm MTF f2.4 90mm MTF f4 90mm MTF f5.6 sample photos by Nikon Z7, sample photos by Canon R: Sampls photos by Fuji X apsc sensor camera using the same optic system:

Nikon Z6 review at Engadget.
Nikon 50/1.8 S OOF PSFs (Jim Kasson).
Nikon 50/1.8 S, Otus 55 on Z7; Zony 55 on a7RIII (Jim Kasson).
Nikon Z 6 Review: Updated with Dynamic Range Assessment (CameraJabber).