In the last 2 days of unveiling anticipation, the actual unveiling and general excitement and good outlook surrounding the WiiU, Nintendo's american stock NTDOY bounced up 7% in 2 days, going from 14 to 15 $ from Tuesday to market close today. The japanese 7974 counterpart also bounced up 7% in the past 2 days, but more gradually, going from 8600 Y to 9300 Y from Tuesday morning to EOD Thu (currently Market open Friday, but still flat).
Expect the numbers to ramp up from here on out, and to explode by next Christmas.