Well, they just got rid of their '07 WRX. They also had a Saabaru (non-turbo) that was recently released. There's the '95 Impreza they made the rally/rallycross car out of. They currently have an '08 WRX.
How much Subaru can they possibly do? Personally, I'm hoping to see more American cars in the fleet, I think they've had about the same number of American cars in the stable as Subarus alone in the last couple of years (going off memory). I know they've been dabbling in Neon stuff lately, they were fooling with a 'vette a while back but I don't know if they still have that around the office. The Mustang coverage in the last advertiseme...er...issue was a bit overwhelming though, too much of anything is no good. While I do think the Subies are great cars (note my stable currently has two - a Saabaru turbo and early Impreza) there's only so much room for Subies IMO. They've been well covered in the past and they are pretty common cars, in that the chassis are common for many years (and many models) so the stuff covered for an '05 Saabaru, '07 WRX, and '95 Impreza cover a heck of a lot of Subies.
Bryce