There's a lot we still don't know in terms of juggle potential and how the grapple works. In one of the pictures, it looks like she's swinging an enemy around with it, though that's just speculation.
I suspect high maneuverability, acrobatics, crowd control, great juggle mechanics, and spacing. And plenty of turning her back to explosions just to look cool.
The fact that her double jump is a rocket jump makes me think that Itsuno is really looking outside the box for her design template, and trying to remain true to the character.
Yeah they could do a lot of interesting things with the grapple like having her kick off of the enemy or rocket it in the face or use it against other enemies (by throwing it or planting a bomb).
Wonder how charging works, the destruction article mentioned quick and more prolonged charging but is there by any chance instant charging like with Nero? Because charging only regularly, even if fast, will require her to stop firing for a moment.
And what about her control scheme? Will it be regular weapon switching or maybe each of the weapons mapped to a different button and as such allowing her access to all three weapons at the same time? Could help differentiate her and make her style more easily.
Range will probably also play a roll in styling and damage output. The game's enemies are built around close range for the most part so by default just clearing them should be piss easy for her if she plays keep away (and uses the camera trick).
I'm also expecting, or at least hoping for, something simple yet brilliant for her like the Concentration gauge with Vergil and sword rev'ing with Nero. Itsuno is good at this.