Not all of the details are out yet, but it seems like Stasis will be an element type that not only can be added to weapons but also can be used in a new set of Darkness-based abilities. Stasis seems to be thematically based on Ice, and in the trailers, we can see a few enemies being frozen in place after being hit by Stasis.   Bungie has also stated that Stasis can be used differently depending on which class and abilities are chosen. We also know that new subclasses are coming with a lot of customization, so Stasis seems to be able to be used in a variety of ways.