I’ll be the first to acknowledge that brand name doesn’t really matter from the perspective of a well-informed player. Despite this, branding represents a categorization for customers, and in this case seems to imply a “vision” that JAST USA has for its games.
From the announcement:
From the updated release schedule (March 3, 2011):
I find it rather curious that Tenkuu no Yumina isn’t included in the JAST Densetsu brand. It’s a title at least as high profile as My Girlfriend is the President. In addition, Tenkuu no Yumina is loosely connected to Eien no Aselia (many of the staff that worked on the latter migrated to Eternal to work on the former). Not to mention that both titles are gameplay-focused titles that should attract a similar crowd.
Of course, if being branded as Peach Princess means it’ll be cheaper, I’m not against this decision.