Reviving this thread because they've been slowly releasing more details, and the FR-S/BRZ has been making the rounds at auto shows.
I'm really, really liking this car. It looks great and I love the design ethos. Still hope they make an STI/Spec B version with 50 -100 more hp, as I would seriously, seriously consider getting one.
Scuttlebutt is the FR-S version will be $22-24k, and the BRZ will be $25k-$27k but will be a bit more feature-packed and have things like standard navigation, bluetooth, USB/i-pod and optional leather, heated seats and keyless start. Subaru has confirmed that they will be turbocharging the FA20 engine, but hasn't confirmed which vehicles will be getting it.
I think I actually like the way the FR-S version looks a bit better, but am more drawn to the features of the BRZ.
http://www.subaru.com/brz/2013/index.html
http://www.scion.com/cars/FR-S/index.html]