Well, surely we all know about this ending and have seen it at some point.
I've been around some places and I've read that Testsuya Nomura has stated that Xigbar, a member of Organization XIII, has some affiliation with them. Xemnas has also been seen talking to them at some point.
Let's also take into consideration something that Xigbar said to Sora:
"You've really put Organization XIII in a pickle. I guess that must be why the keyblade chose you. But MAN, did it pick a dud this time. You don't look like you're half the hero the others were."
Others? Keyblade? THIS time? This clearly means that Xigbar KNOWS of other Keyblade masters. The armoured men have seen with Keyblade's.
I'd like to ask everyone:
The Three Armoured Characters - do they fight for light, or do they fight for the darkness?