Allow me a moment of Whosquee?

Had lunch with a friend today, who pointed out that there are less than four weeks to go until season 6a. (Question: did Moffat decide on his season-splitting innovation entirely so that he, too, could have a 'Season 6b'?)

So I caved in and watched the trailers.

..No, there are no spoilers here, because I have nothing of content to say in response; however the excellent geeks over at Unlimited Rice Pudding have noticed something very exciting about the super-short teaser-trailer for the first episode..