Well only the new Dubai is brand new to the series, but Maple Valley, Mugello, and Suzuka along with a couple other tracks have shown up for the first time since forza 4, which was 6 years ago. I would've called the track selection a bit stale if it weren't for the dynamic weather system, which gives new life to tracks that have been raced a million times already. It adds another degree of variation to the same track that you've always raced. Nurburgring in the dead of night is vastly different than in clear conditions, for example.

Isn't that a good question for all milked franchises.

Actually its 32 locations and if you didn't buy any of the two expansion packs from FM6 the game has three new locations.

Right now you can buy most of the cars directly from dealerships and some can be unlocked in the career mode.  The other locked cars will either appear in the Special dealership which changes once per week or will be prize cars in the weekly forzathons which don't start until November.  Some also randomly show up as a prize when you level up and some should be in loot boxes but none are in them so far.  Not sure if some of them will randomly appear in the auction house which also doesn't start until November but I hope not since they had unicorn cars once in a while in the auction house in FM4 and that really didn't work out well since prices got way too high.  Maybe you can randomly request a car by posting a reply in the week in review thread on forzamotorsports.net again in the near future that is how I got all the unicorn cars in FM4 and the first Horizon game.

It makes people look forward to cars that didn't buy the car pass.  Plus all the cars can be rented and used in free play but if you want to earn credits in free play you have to use a car that you own.