I'm hoping for a new assassin class WITH MORE SKILLS. Look a Zer0's trees, they're the bare minimum which makes him more boring to play around with much faster than the other classes. IMO
I have played Zer0 extensively and Maya extensively.
Zer0 is great class and many different ways to play. My favorite is cunning tree as main tree and than others to support my play style. Note played him extensively as Melee for long time only reason I went cunning (kunai with marked for death is awesome) after melee is cunning helps more when fighting the bosses. Didn't focus much on sniper tree other than some of the skills like Bore. Zer0 just like Salvador I would imagine is going to be an acquired taste meaning need game time to grow on you.
To original topic. I would like to see a new class but I hope it is different than the classes we have now. 1) Salvador- Dual weapon wielding tank 2) Axton with turret (similiar to Roland already done in BL). 3 Maya siren done in BL but with different styles phaselock vs phasewalk 4) Zer0 unique even to mordecat as essentially he is just a pure fighter/snipe/melee person with temporary invisibilty but not invincible 5) Mechromance very unique in skill tree but similiar to Mordecai for special ability. She has a robot and Mordecai had blood wing.