I loved playing the Nobunaga's Ambition series all the way since SEGA Genesis/MegaDrive days. :D
My concern here is the release of this game being cross region without English language support. It seems to me they are testing out the fan base and what the demand will be for multi-language. If that's the case, then we might be seeing an English Language support update sometime soon. We also might be seeing many more games of the genre as well later on if the game proves successful cross region. I would love to see Romance of the Three Kingdoms brought out as well. :)
In the state this game is in right now, I will say hold on to your money and wait for an English update. But, if you know the language, you will have a head start at enjoying this awesome game. :D
For now, keep it in the wishlist and follow the community group page for this game to get notified if an English language support update becomes available.
About the game though, I noticed it is more strategy based than the previous NA games and focuses a lot on diplomacy. But what I really like is that now you are able to create the Era, Nobunaga originally intended on for a united land. That's awesome. :)