There is obviously no official word on whether this will interfere with the launch of the Wii U, but it is being speculated that it could be the case.
(Quick translation by me)
Due to the expanding anti-Japanese demonstrations against shops and factories related to Japanese businesses in China, electronics makers and distribution companies have closed up some of their factories and shops for September 16th due to damages caused by the demonstrations.
Major electronics parts producer Mitsumi Electronics has announced that due to damage caused by the demonstrations including arson-related damage, they will suspend operations at their Aoshima factory until the 18th. Because the extent of the damage is not fully known, it is currently undecided if they will be able to resume business on the 19th.
This factory produces parts for Nintendo game consoles, among other things. Panasonic also had damage issues with their factories/etc and have suspended three of their factories until the 18th.
These demonstrations have been a hot topic in Japan the last few days.
With the Wii U looking like a pretty hot ticket since the official announcements, it will be interesting to see if this makes launch shortages even more of a problem than normal.