So even if Nintendo does release an update for the Wii U that includes updates for the vWii, there may be a chance that neither of them accept updates anymore. This could mean problems for your Wii U in the future. If you just bought this console then you would return it as soon as possible.
I saw a mention of formatting the system memory in an earlier post, that wont work as the Wii U will not re-install vanilla IOS to the vWii.