La Jolie wrote:

Thanks, nakahara - as I said in the "What's the Special about?" thread (in which my question really belonged... sorry, mods), I'd feel happier if there WAS any ACD in it, but I suppose we'll just have to wait and see.

I guess that even if the storyline will be original, we could have references to two or three ACD stories in it (the way it was in the Great Game, for example).

But as far as I remember in The Blue Carbuncle there was nothing along the lines of protecting someone, a bride, suicide and no mourning Mary Morstan on a bycicle. It's quite a harmless story I think.
I remember having seen this scene with John talking to the newspaper seller and asking how the "Blue Carbuncle" was selling/going or something like that. It could very well be the only reference.