Heroes of Mana review at IGN.

"Whether you agree or not the truth is simple: The Mana series is evolving, and it may never be what it originally was during its glory days on the Super NES. Series creator Koichi Ishii (Mana's Miyamoto) has stated time and time again that he wants to continue to evolve the progress the series, moving from gameplay style to gameplay style depending on what type of story he wants to tell, and specifically the platform he is focusing his efforts on. On GBA it was Sword of Mana, and on DS it started as Children of Mana. Now that the team has had the time - and resources - to focus on what the DS can do Mana has again morphed, this time to the world of real-time strategy."

Full Source: IGN