I would think so. If it follows the same pattern as Knights of the Old Republic it will come out on Xbox first and then come out on the PC around Christmas time.
I too hate playing Bioware games on the console system. Knights of the Old Republic was very difficult to play on Xbox because it really was a menu-driven game.
However, I will say that Jade Empire does have an action-based combat system which will really require a control pad to play well. So I would think this game might actually be easier to play on the Xbox instead of the PC.