Although there has been no official confirmation as of yet, it appears that Nintendo will not allow Lucas Arts to develop a Wiimote Lightsaber because it is worried about injuries that may result from "bat like" attachments. While I understand Nintendo's predicament, they are going to have to stop changing our diapers sometime. Just slap a warning on the thing and cover it in NERF or something. In the meantime, interested parties could always settle for the wide assortment of unlicensed products that will undoubtedly pop up. [MaxConsole via WiiNintendo via Kotaku]
It would still rely on accelerometers and bluetooth to transmit position information, the infrared is used for establishing where it's pointed relative to the screen. If you used a nunchuck to move a character around you could still use the wiimote as a sword to pull off swings and slices and jabs.