This video is a recorded presentation by someone from SOA and has a lot of very specific details about the new WRX. Here are a few highlights:
*The unibody is largely unique to the WRX. They have a cutaway chassis showing just how much metal underneath is different from the standard Impreza, and it's quite a bit.
*The engine is mounted incredibly low, as in the top of the engine assembly is level with the headlight lenses (see 4:22).
*The FA20 is a variant of the new FXT engine (no surprise there), but has stronger internals and of course more agressive tuning. The WRX engine has a longer chain guide, stiffer valve springs, and roller valve rockers compared to the FXT engine. AVCS control has been expanded over the EJ engine. The horsepower and torque curves are near-identical in slope to the outgoing EJ engine, but with more area under the curve (see 4:27 and 6:00).
*The CVT "shifting" actuation is faster than the dual clutch boxes in the GTI, EVO, and ISF (see 9:16).
*The CVT WRX has remapped throttle response compared to the manual, doubling the GTI and A4 in terms of acceleration with respect to time. (Side note: this could translate to a twitchy throttle, but certainly means it's more responsive, regardless). See 9:48.
*SI-Drive plays a major role in determining the CVT's driving characteristics. Depending on which of the 3 modes the car is set in, the CVT enables ratio holding during cornering, engine braking, etc. The takeaway is that unlike most CVTs, the WRX CVT will not hesitate to hold low ratios to keep the revs up and maximize torque (see 10:17).
*Fun fact: 70% of BRZ owners buy the six-speed (see 11:22).
* Braking deceleration was benchmarked against the Porsche Cayman S and the BMW 335i, and the WRX falls solidly between them. Interestingly, the BRZ matched or exceeded the Cayman's braking performance (see 16:01).
*The new multi-function display adds a lot of GTR-like vehicle information (see 19:34).
*The available Harmon-Kardon 440W sound system was custom built from the ground up for the WRX, and adds addition mass dampening for vibration resistance. The system is tuned toward more bass response (reflecting the typical WRX buyer's preference, lol) and can produce 40Hz tones at 100dB. It should have plenty of punch. See 21:02.
*They totally glossed over the new LED headlight option, but the standard Halogen headlights are supposed to have 10% better illumination over the old lights (24:07).
*Rear backup camera is standard on all models.