The announcement was made today on the official forums:
UH-1H Multi-Crew Functionality - currently in internal testing
This hugely anticipated feature is close to seeing the light of day. We have begun internal testing of multi-crew functionality for the Huey. The initial testing is progressing well, and it will allow two pilots to fly the Huey as a team. Pilots will be able to interact with each other’s panels, and it should be a beet fun addition to an already excellent module.
The lack of this promised feature was something the community had been complaining about for some time and it's great to see it finally coming to life.