I think will work in a similar way to other DPS classes. First, they will increase they buff applying skills/Spells, then open a combo with Melee attack, go back, and finish the combo with spells, chaining posterior spells after this. Making the melee combat only as opener to start the rotation. Something similar to Enochian where you need keep it up, you will need keep up wahtever buff gives you the melee attacks. Only needing go melee when you lose it. Probalby will work in this way. About MP magnagement, no much idea, but probably will have a system to drain Mp from the melee attack, like the Drak Knight.

I think the distance wil lbe demanding, melee for combo, ranged for spells. Probably won't let you cast spell on melee range (this way will avoid people stuck in melee all the figth for lazyness), making player change between melee and ranged depending of the rotation.

I don't think will have things like Paralize or Slow. That things probe useless all the time, and probably the rewrok of skill will make them dissapear. Same about elemental resistances.