I think Hayward opts in, then later signs a new contract with Celtics for 2 more years, with player or team option for 3rd year.
He is our secondary play-maker to Kemba. In some ways, he is even more of a play maker than Kemba, and I'm not knocking Kemba, just that a possession by Hayward more likely to result in an assist than a possession by Kemba. Kemba has better ability to create his own shot than Gordon, which is contributing factor.
He has become a real good complement to the 2 J's, especially Brown. His lack of ego makes the team environment comfortable for Tatum and Brown to flourish. The guys really seem to respect him. And let's be honest, now that they see how much better they play with Gordon, and without Kyrie, they understand what the real problem was last year; it was never Gordon.
P.S. Al Horford looking worse by the game. I don't know if it's system, age, or both, but frankly am glad, in hindsight, he opted out; think it would have been a mistake to re-sign him. I don't feel that he would add any significant value to this team. Theis is just as good defensively, and Al's play making not really needed for this squad. His absence probably helps Hayward flourish more as a ball handler.