Given Pop Fizz's name and his figure, it looks like he will be able to blow magic bubbles at enemies and I think different colors as well. Such as orange which is impact damage, pink which seek out enemies and green which damages over time similar to his potion throwing where he can change the potion. I also think there will be a button mash upgrade to blow a really big bubble to trap enemies in.
Lava Lance Eruptor looks like he'll be using a melee attack instead now, kinda like Fright rider, he will probably sway that Lance at enemies with different combos.
What I'm even more interested in seeing, is how the reposed eon's elite's will play now that they look like they have new attacks (shown on Figures) such as boomer. Maybe he can now throw those bombs he used to plant down in place of the dynamite.