Morales uses energy instead mana, and has new talents which support this. She burns out of energy much faster so she won't be that powerful now.
Leoric talents rework (finally!). On first lvl he choses heal ability (swing, dead minions or activate). He will get some armor, his AA can deal aoe dmg (it looks first attack is single target strong hit and then comes 2 weaker aoe swings). On 20, his armor boost will be replaced with protect, and he will get more powerful version Burning Rage talent.
Edit: Also Jaina rework (and DREADLORD JAINA skin!)
Her trait has quest: deal 15k dmg to chilled heroes. Reward: Improved ice block (on video he got it around 13 lvl). On 20 she gets upgraded blink (chill nearby targets) and new talent - chill can stacks twice and slow up to 40%.