You can go through mobs now although the mob will obstruct you a little bit.
MCPE-17824
Bug of mob hitboxes
Resolved
Works As Intended
0
(Unassigned)
Unconfirmed
Tablet - Android - Samsung Galaxy Tab 3
0.16.0
Retrieved
The mob will still go to the direction where you are walking, but you can still walk through them. Sounds a bit complicated ...