Namco Bandai is developing a Wii exclusive RPG currently titled Fragile. The teaser site (in Japanese) is live, with the full site set to open on the 26th.
Hopefully this will be a real RPG and not a thrown together title using the license of a popular series that amounts to little more than slashing the Wiimote at slimes. We're not mentioning names, Dragon Quest Swords.
Keep your eyes open for more info about Fragile as it is revealed.