Yes, we've had many many threads about this. Here's the elevator answer:
1) A Brooklyn pick, but Ainge won't trade their 2016 for him. The 2017 or 2018... maybe, especially if they're top 2-3 protected. I also believe one decent player would need to be added to justify it to their fan base, considering their not short on lottery picks. Sullinger or Turner come to mind.
2) Marcus Smart and one other asset, like Sullinger, Young or a non-lottery 1st. This would be Philly's preferred route considering they're looking to actually build a roster at this point.