One theory I developed this morning after seeing the Evo prices is that Mitsu did not anticipate that the Subaru would drop the price by 4K while including the Navi and BBS and they thought that the STi will be around the same price as the outgoing model. This would somehow justify the Evo pricing.
Things may not be that bad for the GSR since optioned with Navi, HID and Rockford Fosgate (if made available in Canada), the price could land in the same ballpark with the STi and they are equivalent with the manual tranny save for the BBS on the STi and Recaro seats on the Evo. Performance wise, the GSR seems to be enough to take on the STi (and beat it according with the car magazines) without needing the suspension/breakes/wheels/tranny upgrades in the MR.
On the other hand, the MR/MR Premium prices are hard to justify.
Certainly, it will be interesting to watch the sales war between the two. As far as I'm concerned, no other car plays a role in this game. Perhaps next model year, after getting hammered over this year pricing and potentially low sales, Mitsu would make the necessary price adjustments.