Indeed. Though I will admit I'm a bit stumped as to how the mental form would look. The Social form is easy - a totemic, awe-inspiring (humanoid or no) version of your spirit shape (think Aztec or Egyptian gods). But the mental one is less obvious.
And of course, deciding what else it should give. Mutations seem kind of silly to give for Social or Mental forms unless we also make a host of socially and mentally useful mutations to go with them, since the grand majority of mutations in canon right now are purely physical.