So, what are your theories about Frostmourn in trailer?

[ÄštráĴÙVÅ69-1859]

I really hope its a new Sword-Wielding Tank Hero but its probably going to be a Reinhardt crossover skin:

New Sword Hero Teaser?

At the end of the Season 12 Official Trailer, there’s a brief scene on Watchpoint Antartica, where a large Mythic-looking sword cuts down into the icy ground with Juno in the background saying “What was that?!”. From the pattern of hero releases, I think its pretty safe this new hero will be a Tank. Who will be this new sword-wielding hero? Any ideas who it could be?

A skin/weapon crossover with WoW would be great but a new Tank hero would be awesome