They should, also keep in mind the other brand of theirs they have for accessories, Five Axis. Going off of what they already offer, i'm hoping that it's not just an aero kit but a whole exterior package, wheels, spoiler, etc. A new set of Five Axis wheels that debut on the iM that complement the iM's design is something I'd want to see.
If you take a look at this picture of the Toyota Auris, you can see that the Toyota Auris and the Scion IM certainly seem to share similar headlights. That should add to the idea that the Scion IM will be a re-badged Toyota Auris.
The Toyota Auris is a great vehicle with AWD, a six-speed manual and a wagon version, so I'm happy that Scion is getting to share in the party.