The superb is a different chassis to the exeo - it has transverse engines plus skoda already have an established 4x4 estate in the octavia/scout so it's a logical step for them.
I can't see anything other than the current range of engines being available, perhaps a higher power 2.0T sometime in the future. I'd say of the two things being discussed 4 wheel drive is more likely than having bigger engines. I'd like to see the 2.5 straight 5cyl in the TT RS being used in more cars, but again it's transverse and a probably a bit long to mount the other way.