If they do, I would be suprised. Subaru dealerships don't really want the vehicle because a RWD vehicle doesn't really go with their brand. Toyota is getting the Supra, so that will add another lightweight RWD vehicle to their lineup, although it will only be offered in an automatic transmission...
Looks are subjective, but I prefer the look of the BRZ over the 86 and Si Coupe. The front of the Si coupe looks good, but the rear end is a little too busy for me.
They could do what Hyundai is doing with the Veloster N. They offer a base trim that has 250hp and then a performance package that provides 275hp and other upgrades. This increases the base price by roughly $2K, which would still make the Si a good value and not step on the toes of the CTR...
What RPM are you cruising at if your going 75-80 MPH? I'm guessing it would be around 3K? I'm surprised how you can get that kind of MPG cruising at that RPM. The highest I ever got was around 43 MPG and that was with me barely pressing the gas pedal.