We still don’t know what Ryan Murphy and company have up their frayed sleeve for the sixth installment of FX’s American Horror Story, but today we got a new logo. It’s a blood-red — natch — mashup of the number six and a question mark. How’s that for mystery? Mystery is a key word: There’s been radio silence on a theme and title for Season 6 of AHS, but series creator Murphy said at TCA in March, “The interesting thing about the next season is that we've been working on…