Cube is in testing.
It was for a degenerate version of commander.
It is a rather large draft at the moment with 900 cards.
Draft will take some time: 10 players, 6packs 15cards.

Summary of the Idea being implemented:
The main difference from normal EDH//commander, is that the commander does not start in the command zone but in the deck.
The commander mechanic will resume after it dies on the battlefield. A player cannot claim a win in a game if their commander has not been on the battlefield.
Mono-Colored Commanders are not allowed, Must be multicolored.