First Impressions on Sherlock Series 2: Episodes 1 & 2
Scandal
Confirmation that Moriarty is very, very creepy and is most likely actually Moriarty
Confirmation that Sherlock is (most probably) asexual
Confirmation that John loves Sherlock "very much"
The Godtiss made Irene Adler awesome
Mycroft is not God, though whether he is Captcha is still being debated
Hurt or upset Mrs Hudson and you are … well, there aren't enough words for what Sherlock and John will do or allow to be done to you
Mycroft is a very lonely man
Hounds
Clearly determined that no Henry can compare with the Russian one
Established the fact that Sherlock begs so pretty, and is also capable of feeling regret
The UST is growing exponentially and gives hope for further tension in Reichenbach
Sherlock is absolutely terrified of Moriarty
John handles being drugged far better than Sherlock
John needs to pull rank more often