User blog comment:SymbioteKitty/New Season/@comment-1609005-20131205163112

Apparently, according to 2chan and another Japanese image board, the Happiness Charge Cures are called:

幸野心音　Kouno Kokone (Cure Lovely)

姫野雅　Himeno Miyabi (Cure Princess)

吉良ほたる　Kira Hotaru (Cure Honey)

And there's still one more Cure rumored to be in the team, named Cure Fortune.