I don't understand why anyone would want to change the formula used for Valkyria Chronicles to a generic RPG format. Seems like it guts the distinction it has compared to other strategy role playing games of it's kind.
We really have no details on the battle system yet.
Apparently it's a 'new' battle system, and it has a name:
'LeGION' stands for 'Lead a Group Into Outrage & Numerous army'
Typical Japanese nonsense, but take from it what you will...