I think these are all the new stuff that MC can do:
MC still maintains his mostly technical combat style, based on defensive sword play, tactical usage of his tail, baiting for an opening to use mantis punch and only increasing his mass to deliver extremely powerful attacks based on momentum.
He can now augment this style with exotic materials, armor and weapon design, taken from monsters. His mental attacks also help in giving him an edge as long as he can maintain his technical advantage.
I can't wait to see how he is going to incorporate the new "Frozen form" and "Reactionary hardening" abilities into his combat style, or if he actually has enough power to even attempt it in his current power level. I also wonder if we will see offensive transmutation abilities, especially ones delivered through attacking since his powers seem to favor touch.
I can easily imagine MC's swords instantly transmuting whatever mass they come in contact with to a softer material.