Holmes and Watson must search for a killer without any physical evidence to aid them after a bomb is detonated in the New York City morgue. Also, Watson is suspicious when an NYPD detective she's in a grudge match with asks her to consult on a case.
Wanna know if Sherlock and Joan will ever hook up? https://t.co/TTFnw62k3w— Elementary Writers (@ELEMENTARYStaff) January 28, 2016
“Elementary” has, so far, steered away from any romance between Holmes and Watson.
"... There are some things you can play with and some you can’t. The fact that one’s a man and one’s a woman is irrelevant ... The original Holmes and Watson were not romantically involved and, therefore, neither should we [be romantically involved]. ... That won’t change unless someone else swoops in and takes over and turns the ship upside-down."
Source 1 + 2