I've been thinking:
[HIDE]They seem to be sowing the seeds for later encounters pretty early. Judging from what said about Kit's perdicament with the law and family, I think it can be safely assumed that Kamen Rider Onyx (Ryuga) is the true culprit.
Likely Onyx, like Ryuga, is Kit's Ventara/Mirror counterpart and thus would be perfectly be able to incriminate his other self and escape without a trace. This is further supported by the episode descriptions that claim that Ventara's Dragon Knight (All riders being linked to their counterparts on both worlds) was the one who betrayed the others.
Undoubtedly this will get referenced when Onyx appears and probably take the roll as the "13th rider" likely either in Xaviax's employ with a dark copy deck or as a wildcard in the Rider Fight.
If so I have to commend the writers as it would be a far better explanation than what was used in Ryuki. Why did Shiro Kanzaki just happen to make two decks that are nearly identical and are colour scheme opposites? Just doesn't make sense story wise other than to force a "Mirror Match" for the movie. [/HIDE]
Overall, I look forward to see what they have in January and the coming months.