I have had a 2002 wagon, an 2008 and 2011, All have traveled my family relatively comfortably for trips up to 2 1/2 hrs. My family includes my wife, my sons, both are 6'2". My daughter-in-law even crammed in for a few trips. I'm not saying it wasn't tight but they were all able to fall asleep.
I would say that they are much more comfortable for two people, especially on long trips.
From what I have read/heard, the next WRX/WRX STI will be based on a shortened Impreza frame, be powered by either a 1.6 or 2.0 and produce somewhere in the 300HP range for the STI. It has also been said that it will be a coupe...but not the BRZ STI which, if it happens, will be an entirely different car. Search around. There is a lot of info out there. Find the video for the introduction of the BRZ at the LA auto show, go to almost the end and watch. The Subaru rep talks about the next WRX/WRX STI