In the latest Little Dev Update videos, there are additional gearbox options visible in the menu, though I'm not sure if they'll be ready for the next release.
Ride height won't be visual yet, but the calculations are better, and the way that they affect the cars performance is being improved as well (I think, a Dev can confirm?)
And costs will be implemented in the next release, along with some other stats such as man hours, reliability (formerly MTBF), cabin space, and passenger capacity among others.
If you want to gain a better insight as to how the development work is getting on, check out the AutomationGame YouTube channel, where Killrob showcases the progress being made towards the next big update. Also you should take a look at the Devstream, there Daffy livestreams any development work he is working on at that given time. He updates the Livestream Announcement thread each time he goes live.