I've always wondered if there will ever be toasts or some kind of feedback about the mechanics of level up.
The devs are obviously trying to avoid gameplay intrusion and text-based indicators as much as possible in favour or loading up the sidebar and 'natural' indicators like the flying health and mana beads.
I think level ups need toasts of some kind, just to show the effects on level up. Over the last two years they have REALLY added up and there is no indication of what happens on level up. I know now because i am so used to it, but i cant help think that players won't 'get' all the different effects that happen in the blink of an eye without indication.
As far as i know they can include:
- More HP (variable between classes)
More base attack (also variable between classes)
HP and Mana refill (+ item based increases)
Cure Poison / Manaburn
Item use reset
This is a dodgy mockup i made, but i would probably suggest something more subtle and transitional.