My biggest worry after game 1 is that the Celtic's just don't have enough jump shooters. In particular, of the players likely to get significant minutes as reserves, only House is a pure shooter.
While Tony Allen and Bill Walker both had impressive scoring plays those plays were driving or dunking. With O'Bryant, Powe, and Davis being the other likely second teamers there is nowhere near the balance between outside shooting/driving they had last year with Posey.
I thought the biggest plus was the ball-handing displayed by TA. While last year some teams, mainly Detroit with Lindsay Hunter, were able to take House out of the game because he couldn't get the ball up the court effectively, TA looks like he'll be able to swing over and help out with the ball-handling, which will make it easier to take advantage of House's great shooting even when the other team has a very fast defensive player on him.
Bryan