Expect LED lights and also gullwing style doors. Like earlier reports of 700+ horsepower and 740+ pound-feet of torque Automobile says the gasoline six-cylinder motor is expected to provide 550 horsepower with two 75 horsepower electric motors providing another 150 horses. Automobile gets things wrong so this isn't set in stone, it just sounds like people are guessing right now.
For this vehicle to actually compete against the Porsche 918 Spyder it really would need something in the 700 horsepower range. Not to mention hybrid drivetrains don't tend to be all that lightweight thanks to the batteries and electric motors. Also Audi was quoted earlier saying this car will be the "absolute best" which means it will need to keep pace with Porsche's best.
Regardless, take a look at the renderings below. Not the best set of pictures and it pretty much looks like Automobile took the basic shape of a Le Mans car and added some LED's along with R8 style vents in back. The fin they added to the roof just looks awkward. It is doubtful the real thing will look anything like these renderings which look amateurish at best. We will have to wait and see.