They released the details on the rework already:
Passive: DETERMINED KILLER - Minions only do 50% dmg to Eve
Q - Hate Spike - Hits two closest targets SPEED: 2000 COST: 12 / 15 / 18 / 21 / 24 MANA COOLDOWN: 0.8 MAGIC DAMAGE: 25 / 40 / 55 / 70 / 85 (+ 40% AP)
W - Shadow Walk - After 1.25 seconds (or 5 if she was attacked) Evelynn fades away, becoming stealthed. Evelynn's next attack or ability will Slow icon slow her target for 3 seconds and break her stealth. COST: 60 MANA COOLDOWN: 12 / 11 / 10 / 9 / 8 STEALTH DURATION: 10 / 20 / 30 / 40 / 50
SLOW: 30 / 35 / 40 / 45 / 50%
E - Ravage - ACTIVE: Evelynn deals magic damage to a target enemy, reducing their armor and magic resistance for 5 seconds. COST: 90 / 105 / 120 / 135 / 150 MANA COOLDOWN: 9 MAGIC DAMAGE: 80 / 135 / 190 / 255 / 320 (+ 100% AP)
RESISTANCES REDUCTIONS: 10 / 14 / 18 / 22 / 26
R - Malice & Spite - PASSIVE: Evelynn restores health when scoring assists on enemy champions.
HEAL: 150 / 225 / 300 health
ACTIVE: Evelynn gains bonus attack speed and bonus movement speed for 10 seconds. If Evelynn scores a takedown or an assist, Malice and Spite's cooldown is refreshed.
BONUS ATTACK SPEED: 25 / 50 / 75%
BONUS MOVEMENT SPEED: 20 / 25 / 30%