Well... I'm guessing the Windows stuff is to do with their method of porting the original N-Gage (Symbian OS) game to the PC.

If they'd written this from scratch for Java perhaps it might not require Windows?

But I don't know for sure, so it's idle speculation.

However, there are some very nice J2ME games out there nowadays (the Java version of Sola Rola is amazing) so I'd still be in favour of getting Java VM on the tablets somehow.