I played it ONCE in a friendly game. We didn't communicate between teammates, but I think that was just an assumption on our part, and not a formal rule.
Notable changes from individual game:
- Achievement and Score wins are based on COMBINED achievement and score totals within a team.
- Demand effects only affect opponents, not teammates.
- Non-demand effects can be shared with teammates, but don't generate a sharing bonus unless also shared with an opponent.
- You must pay attention to the word "Opponent" now. For example, if you use Optics and it melds a non-crown card, you just transfer a card to the score pile of an opponent, not to your partner...