Not wishing to be a party pooper but you'll be competing against Ronin and it's promised mythical expansion.
I'm not sure that's true -
Ronin was designed as a historical game, and the mythical additions have been very much that - additions to meet popular demand (also available - see the OWG resources page in my signature - with more to come). From what I gather,
Daisho is going to be a pure Japanese Fantasy game.
I think anyone eager for something more than
Ronin in the Fantasy stakes will be well-served by
Daisho.