Judging by how Merlin handle their marketing.. I agree we will see more of these clues (obviously) for this month, and maybe some other small teases for January, but I don't think we'll see much of solid marketing until February time. This would make sense as it would bring the GP to look at what is in store for them in "spring" when the park opens for the February Half Term. Having big marketing in January would be a little pointless, since you see it, want to ride it, but can't for another 2 months
like I said, I do think we'll have a few teases in January but nothing big until February, as the hype will increase as it will only be a month or so to wait.