While still actively denied by Nintendo themselves, clues pointing towards a potential Wii HD continue to surface. New trademarks submitted by the Japanese branch of the company number among these, which you can see below:

商願2010-006971 Nintendo∞Wii∞POWER∞Wii
商願2010-006972 Nintendo∞Wii
商願2010-006973 POWER∞Wii

What a "Wii POWER" or "POWER Wii" might be is anyone’s guess at the moment, although there is a fair chance of it just being a new promotional name. Regardness, here’s hoping it ends up better than the SNES peripheral with a similar title.

Could also be the second coming of the forth hourseman of the republic of the new daughters.

Source: NeoGAF