Volibear actually got nerfed in Pbe overall
First off the Buff to his E seems helpful but it's actually not. Ur E does knockback the enemy, so instead of slowing him, u are actually knocking back the enemy away from u and helping him Escape. Sure in some ways the E will be useful but in MY pbe experience actually it's not that much and was a hinderence in ganking potential. U have to reach the target with his Q first or else u won't reach the opponent.
Secondly his W still does no damage, I was 5/5 and lost to a ryze 2/3 1vs1 without him Kiting. And everyone is building Morrellos now which has grievous wound , bye bye volibear passive.
So overall Volibear remains the weakest class in game, and thanks to the new Morrellos and the knockback which hinders u a little bit in ganks, Volibear actually got nerfed overall.
is now a support