They gave riven a buff. She is the same as before but stronger.
Runic Blade (Passive) changed to:
"Riven's abilities charge her blade, causing her next basic attack to deal an additional [20% - 50%] physical damage. If Runic Blade damages an enemy champion, Riven gains 20 Edge.
Riven's damage is increased by up to 10% based on how much Edge she has. If she hasn't gained Edge in the last 10 seconds, Riven begins to lose her Edge at the rate of 10 every second.
Bonus Damage: X"
Passive is now on next basic attack rather than stacking up to three times.
Passive now generates a new resource called Edge.
passive bonus unchanged
+10% FREE damage
ult still does up to tripple damage even to full health targets
the 10% is a buff to all of her damage her passive is U N C H A N G E D