Hybrid combat system?

There's been no indication that anything has changed. They said that we'd be able to have up to 75:25 ratio between the two systems. And the showcased had Steven using the abilities in both modes. The biggest seeming change is that the abilities just work in both modes instead of being purely one or the other (though the grapple seemed to require a target), but that could just be chucked up to the testing stage of development and Intrepid could easily lock the abilities into either system.

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Just watch the tank showcase.
https://www.youtube.com/watch?v=DwWK9HJNJRQ

They not only explain how the abilities work and differ between modes, but Steven uses them in both modes throughout the video. Though it's mainly tab targeting, because Steven prefers that.

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What kind of difference did you expect? Most abilities are the same both in tab and action. You just need a target to cast them if they're purely tab, as the case with the grapple ability.