This is a somehwat speculative thread... but the simple and only real answer is 'no'. After all, this is a DS game here - Nintendo aren't going to go and give out ROMs over the internet and all. There ARE demos in a few places in shopping centres (and maybe connection tours and the such), but that's as far as it goes, and is for the DS, not the computer.
Closed, as there's no realy new discussion to come from here...