Sherlock series 3 - spoilers (episode 1 and 2) and speculation ep 3)

First of all the none spoiler stuff, three episodes a series with nearly two years in between S2 and S3 is too long. If there is going to be a S4 I hope that we don't have to wait for so long.

( now to the spoilers - mostly vague, and speculation about episode 3 based both of the original Sherlock canon and observation made on eps 1 and 2. )