How long is a piece of string? And how long is a console launch window? Nintendo says it'll publish several games in the Wii U launch window, but how big a span of time is that? Leave it to Reggie Fils-Aime to explain.
Fils-Aime told IGN Nintendo sees the launch window as spanning a fairly lengthy period:
It's launch plus the following three to four months.
The good news is that everything first-party we've seen is currently slated for the launch window:
Everything that we've shown from a first-party perspective is definitely launch window.
So from Game & Wario to Wii Fit U, it should all land during that three or four month period and avoid a repeat of the 3DS situation, where Nintendo revealed games in 2010 we're still waiting for in the middle of 2012.