New Dark Frenzy is a little more general-purpose for "I want to run at people, but I've been stopped!" since new Evelynn is highly encouraged to chase enemies down, and no longer deals burst damage quite like she did before.

Dark Frenzy vs:
Slow: Slow removed
Root/Binding: CC removed
Stun/knockback/knockdown/silence/suppression/charm/fear/stasis: Can't cast while stunned, silly!
Entangle: Turned into Disarm