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Something the video is really underselling is the movement speed.** It stacks up to 5 times and is granted on every ability hit.** Her game is about keeping the movement speed stacked up and using it to play a hit and run style or roam around the map.
Pretty fast. Not rammus fast, but she can keep it up for longer by hitting jungle camps.
Current numbers (obviously subject to change): Each stack grants 7-11% (based on Q rank) movement speed for 5 seconds, stacking up to 5 times. Stacks fall off 1 at a time, at a rate of 1/second.