It'll either be like Odin, and they'll just give her higher damage modifiers and give the Atk+ skill something trivial, like a new buff that gives +10% Assault against Fire only.
Or it'll be like Cu, and Shiva's Atk+ will give her a self-buff of Elem+ (+100%) for 3t, burst gives a new unique buff which quadruples damage dealt by abilities for 3t, damage caps removed from nukes, new passive makes each instance of dealing damage with abilities give +30 burst.
Those are basically the only two modes the DMM devs have when it comes to Awakenings. It's either "wow the best thing in this Awakening is a higher burst modifier I guess?" or "jesus christ what are they thinking?"