A theory regarding this new titan that poses a huge threat

My guess is this OG titan on top of how much of a threat it poses (Having titans like Rawa on edge, the first teaser showing Gigaman defeated) is likely subterranean in nature given the activity going on in Siberia and the map showing the hole and unconscious yetis.

I'm also thinking this titan might also have an ancient feud with Zvya's kind who are protectors of the hollow earth.