Gameplay
On the champion Miss Fortune, the W is meant to fully stack Strut, her passive. In use from the summoner fountain, the champion statistic display shows her speed gradually ramping up, even after W has been activated and the buff display for Strut has changed to 70.
I don't know if this is an error with the display or an error with the movement speed not being correctly applied as part of the active, however the display is definitely inaccurate and merits checking.