I don't think marketing new uMotes every few years would be a good idea, unless they're easily synced and data transfer from uMote to uMote would be easy, as well. I am assuming that the uMote will have increased data storage, much more than the Wiimote, and I don't want to have to go through the hassle of data transfer. Also, what improvements could they bring to a uMote?
Also, I think a 3DS player for the WiiU would be a great idea, but it needs to be released later in the WiiU's life, after people have already bought their 3DS's.