After some further googling, I found the iDrive in F10 is designed by QNX Software System based on their proprietary Unix-like OS for embedded systems.
QNX's list of clients for their automotive solutions:
http://www.qnx.com/solutions/industr...ive/#customers
The QNX operating system should have no trouble with unicode according to their website
http://www.qnx.com/developers/docs/6...utfencode.html
As far as language is concerned, iDrive for cars in different parts of the world should only differ in the system language localization(i.e. English + your native language depending on where you bought your car)