Yup... though there are several weird things going on here.
Firstly you might be forgiven for thinking "ok, well it must mean something in Japanese"... well it doesn't... the Japanese can't even pronounce it

And secondly Nintendo HAVE NOT applied for a trademark on the name WII in either America or Japan... although they always do this before releasing this kind of information.
So I have no idea what on earth's going on... some kind of April Fools Joke? Some pre-E3 publicity stunt? Who knows?