First, the official date for a global launch is locked on the 6th of December.
Then, the hard core stuff. The full car list is available on the Japanese GT6 site. There's a note warning that:
" This list is one part of the cars planned for inclusion, and is subject to change."
So far you can see a total of 1197, 124 of those new cars (in the series). But expect more to come, and some of them to not be available right off the start.
Anyway it's a good starting point as it includes iconic machines such as the
I can't wait!
We also got the official new tracks, adding to the not so new, but for the first time free Spa:
Spain's Ascari Full Track (here's Tiff Needell when he visited the Resort)
Australia's Bathurst - Mount Panorama
Silverstone, Brands Hatch and the Goodwood Hillclimb in the UK (here's Chris Harris talking it through)
Willow Springs International Raceway in the US, a revised Apricot Hill Raceway, and a couple new original tracks: Matterhorn and the Gran Turismo Arena:
There is more info about Game Modes (drifting is still in, apparently and hopefully improved as demonstrated by a GT Academy racer below)
... and Car Management, Tuning Options, Online Features but I'll leave that to be discovered in game.
To get it you should reserve it online and get DLC codes for special cars and money, and in my honest opinion, get the 15th anniversary edition. That'll get you 5+20 more cars, special paints, suit, helmet and avatars, and some physical goodies as well. But yes, it's €10 more expensive.
And finally, here's another video to finish off: