Personally I love the feeling when you promote units in fire emblem games, and it looks like we're in for a real treat with FE:3H as there seem to be many, many class tiers this time...even a suspected tier above "Advanced" shown here (there's a scroll bar on the right which seems to indicate another row below advanced, at least).
If we do end up getting a "Master" tier then that'd be epic as hell. Would we get dread fighters, true blades, marshals, etc... again? I hope so!!