A follow up news came up and really tore the heart of Nintendo fans out there.
"DSi software (software that is only compatible with DSi) is region locked, eg: European DSi software can only be played on European DSi consoles."
So it's confirmed. DSi exclusive games and DSi downloadable software will be region locked. Now I have to scratch my head for Japan release only DSi games. What if Japan comes out Ouendan DSi and never be released in other regions? OH THE DRAMA!
Looks like I have to rethink when getting the DSi.