Sherlock 3:3 His Final Vow (no spoilers)

[alicambs]

OMG! Holy crap batman... that was amazing. I'm still reeling from everything that happened in it ( my heart nearly exploded at BAMF! John) and all coherency has gone flying out of the window leaving me something of a gibbering wreck. Give me a few days and I'll have pulled myself together, maybe.

How long do you think we have to wait for Series 4?