I think Yoshi-P said that the new dungeon wasn't supposed to be taken as a hint towards Geomancer but that doesn't mean that it won't happen =)
As for Templar being mentioned, it wouldn't have to use a spear like Dragoon does but it could use a more joust-y type weapon (for those worried about the weapon overlap).
This arithmetician (sp?) sounds interesting but I have no idea about it. All I know is that it's from Tactics.
But hey! there's always Alfie as the new job ;D