Yes, you would be right in observing that the new control system does nothing in particular to improve the game. The implementation of indistinct shakes and waggles of the Remote doesn't really offer any added immersion, mainly because your movements don't feel in any way connected to those of the Prince. So if you've already played the game on another format you won't get much in the way of a new experience out of the Wii version.
Conversely, it's just as playable as it was with the normal control pad. That considered, The Two Thrones was a brilliant game and if you haven't played it, Rival Swords on Wii will be well worth a look.
Rival Swords is due out on March 30.