A. If they make it on the Brawl disk, they will be DLC in Japan.
B. If the deadline isn't met, the content may be delayed. Japan won't have a problem with it, but until US/others have wiiware maybe, or until a solution is found. They have invested into it, and I truly believe we'll see it one way or another.
C. If one country has it, and the other doesn't, online is region locked. And if one player is missing the content, it would be resolved as of a patch. It would be as if you were playing against a character you haven't unlocked yet.
D. While some people may doubt me, it is fine. I 100% believe my source, he's never failed me before.
E. Please realize that leakers/ informers have limited information based on what their source tells them. Aside from raw data and good faith, they have to justify their claims with their own opinions. So I have info on these two characters; but it doesn't mean I know their moves, placement on the roster, or other characters.
F. Those are the most consistent inaccuracies there are. If there are others, I'll do my best to clarify on them.