I came to the same conclusion as you. They are expanding on what midna was in TP (a transformable helper). I am gonna say that each dungeon has a new power is unlocked for her or whatever... I also expect there to be some tradition items too. So there will still be switching. She will just be the weapon, imo.
End of 2009 Predictions (Set, January 1st 2009)
Wii- 72 million 3rd Year Peak, better slate of releases
360- 37 million Should trend down slightly after 3rd year peak
PS3- 29 million Sales should pick up next year, 3rd year peak and price cut







