Hey Lozmoid,
While the Fiat BR20 may have been used by the Japanese, I am pretty sure it will NOT be included in the Japanese lineup. In making these sets, FMG wants each piece to be unique to that country. So, I am sure the Japanese Transport Plane/Medium Bomber will be a model that was uniquely Japanese, both in production and use.
Also, the Mitsubishi G4M bomber IS the “Betty”. “Betty” was the Allied classification for this bomber and G4M was the Japanese classification. Like the Mitsubishi A6M fighter was referred to as “Zero” or “Zeke” by the Allies.