My main concern will be the power to weigh ratio. I know weight will be a challenge, but power shouldn't along with other more adjustable things we all hoped the outgoing gen had.If the weight is kept around the same and the front to rear balance is similar I think the handling should still be decent. The mule also looks to me to have bigger wheels and tires. I'm guessing 18 inch wheels and 225 width. Longer front and rear overhangs, greater distance from the rear of the door to the front of the rear fender, a higher and flatter deck spells more rear headroom, legroom and cargo space. I'm predicting 173 inches long (up from 167), an inch or so taller due to taller doors than the current generation. The mule also seems to be wider than the current car. Clearly Subaru/Toyota want to make this a more usable sports car. It should be similar in size to the Supra but with a lot more interior room. Car probably has a wider track I'm guessing as well. The big issue is going to be the engine characteristics. One would think with the larger 2.4 and assuming it remains NA that they have engineered the "torque dip" out of the equation. I'm hoping the've made the engine smoother and free revving with a slightly lighter flywheel.
Finally I hope they have worked on properly tuning the exhaust with plenty of pops etc.
Looking at the current 86 from similar angles helps to imagine what the GR86 will look like in person:Well of course this is a photoshop. Based on the mule the front end appears to be looking fairly accurate. The greenhouse looks like its from the old car(taller)but the Hoffmesiter Kink seems correct from the mule. Not sure about the top of the rear fender. On the mule it seemed flatter. The door, the fender slit and the skirting seem pretty close to me compared to the mule though. Overall I'd say if this is 90% of the real thing this is going to be a nice looking car and I prefer it to the current version.