Did you see my reply? 

 Nintendo must have paid capcom quite a bit of money ｔｏ get exclusivity for the RE franchise though.  I know they gave money to capcom to help them make RE4, it was probably a similar case here.

I'm sure capcom ｗａｓ well aware they could have sold 50-100% more copies on the PS2.

You posted while I was typing, so no. =P

I'm still not convinced of your explanation, though. Sure they might have lost money on RE0, but it doesn't take a rocket surgeon to see re-releasing a not-very-succesful game isn't the best way to make it back.    

Lord:
RE0 losses are already dealt with in the year it launched, they don't have any financial trouble of it right now.

But: RE0 is probably the least known of the bunch and the game is there, so it is a good way to make some money. If it sells 100.000 copies that's like 2 million pure and easy profit, since the Wii-additions seem to be very small.

Well not just that game. Capcom had two very bad years around that time, largely due to spending too much on the big games. Even if it was dealt with then, making some more money off it now might be a way to regain face for it. 

I first played RE4 on the Wii and I loved it. I tried to play the gamecube version and the controls just didn't feel right. I wish they would release RE0 in America. I'd definitely get it.

I liked RE0 for the Cube. Not as good as REMake, but still fun.

I could be wrong, but I suspect that a large portion of the motivation for Capcom to release ports of Gamecube games on the Wii is that Capcom is trying to recover the costs of upgrading their toolsets to take advantage of the Wii ...

The same engine was reported to be used on Resident Evil: Remake, Resident Evil 0, and Resident Evil 4. With how little support the Gamecube received from Capcom after the release of Resident Evil 4 it is likely that Capcom stopped working on this engine in 2004. It is plausable that Capcom is trying to improve this engine to truely take advantage of the Wii, and to be compatible with the same tools they're using with their Resident Evil 5 engine; being that they didn't anticipate the need for this, it is possible that they have a large team of developers (10+) working on this in order to accomplish their goals rapidly which can cost Capcom more than $1 Million per year.

 I don't think so.  Nintendo helped fund those resident evil games on gamecube, and RE4 was released on PS2 and combined with the GC version sold around 4 million, then put the 1.7 million from the Wii version on top of that and the profits should be good.  YOu might be right that they want to fund an engine, but not because of those games.  

I suspect they want to re-release it in Japan because they feel some Japanese gamers didn't play it because they never had a gamecube, and this would put some attention back on the game.  I doubt it will sell very many copies, but i doubt it will matter if it does or not. 

Any particular reason why a game set for Japan only has an English voice track for the trailer?