Evelynn teaser (Ability speculation)

Passive?: Her stealth. The beginning of the trailer shows that Eve moves fairly quickly while she's not being looked at. She's very likely to get boosts while being in the fog of war. She becomes black while in stealth, this is confirmed by a rioter, but it may not be her passive. She may also leave some kind of LB W when becoming visible, but that may just be part of her third ability.

Ability 1: Hate spike seems to be quite different. She throws a dagger-like projectile at her target, marking it. When the mark is completed, she charms the enemy and her old hate spike replaces autoattacks, basically, as you can see when she attacks Yasuo. If she attacks before the mark is completed, she creates a small patch of spikes and consumes the mark, this can be seen in the Lucian clip.

Ability 2: Eve thrusts forward with her tentacles. Can be seen in the Lucian clip. It may be a part of the first ability though, when she attacks an enemy that's not fully marked. May be a skillshot or autoattack enhance.

Ability 3: Evelynn hits enemies in a wide area in front of her.

Ability 4: At 0:30 you can see Evelynn landing from a fall. Could easily be a taunt, but mobility creep makes me question that. Maybe it's some kind of jump.