2018 86 trim levels
 

Saw this today, looks pretty in depth. It reflects what's currently offered in Japan and Australia, as well as mimics what we've heard about certain colors being offered on certain trims;
https://cars.usnews.com/cars-trucks/.../86/2018/specs

Edit: Just had someone contact me, and confirm all this information is true.

As for the Performance package, I don't have information, but I do know that the black trimmed version comes with Brembos in Japan standard, but as an option in Australia.
I really hope it'll be available here.

Getting the JDM GT Limited black edition would be huge! My bet is that the black trim will have the PP on it.

So Toyota may be offering their own "limited" version? It will be interesting to see how they price it compared to the BRZ as it really would be the same car and they couldn't spin it as a rare special edition. I hope the performance pack makes it over as well. It should if they're finally bringing in trim levels.

JD Power is showing another trim as SE

http://www.jdpower.com/cars/Toyota/86/2018/trims

Being that (se) and (gs) are in the same parentheses as (natl), maybe it specifies region rather than trim? Otherwise that list is the same base/GT/GT w black trim as the other.

Special Edition. Whether that means the 860 or some new one we don't know.