It's about as flamboyant as you could expect. In fact, I'd say it's enough of a subtle improvement over the standard Impreza that I'd call it reasonably good-looking. As much as I gave the Impreza a lot of grief on it's introduction, it has grown on me. Tweaking the front for a late '90s style vibe is a step in the right direction, while still maintaining the reasonable and well-mannered proportions (and pieces) of the current car.
I think my only complaint is that the rear spoiler on that prototype is ridiculous. It's pretty clear that they're pulling on the 22b heart strings, but that doesn't do much for me. Turn it back down to 7 or 8, as a WRX should be, and leave these pieces for the STi.