New Pokken Info! Pikachu, Suicune, and Gardevoir confirmed! Gameplay footage inside!

[Frogger]

Samus Aran said:

Ferrum refers to iron, usually swords.

Maybe Ferrum is an industrial or smithing region? I dunno. There's nothing "iron" about the actual quality of the battles, no swords or anything like that, so it can't be a descriptive term.