I don't take this as rumor so much as informed speculation, but it is an interesting topic so here's the quote from Rich Levine of CSNNE.
"They're already got Avery Bradley, they've got JaJuan Johnson, they've got E'Twaun Moore . . . I don't think they can [keep Johnson and Moore and two rookies] if they want to be deep enough to compete. "So I think they're going to try and package and move up. Maybe move it for another piece. You know [director of basketball operations Danny Ainge is] going to be wheeling and dealing; that's what he does. But I'd very surprise if they take both picks."
I already wrote this evening about the pitfalls of moving up in a "flat" draft, but moving a pick or two for current assets certainly makes sense. The Celtics don't have many movable assets but they could very well do a trade of a pick for a player and take on more salary than they send out due to their cap space.
The only trick would be timing, as I don't think they'd renounce free agents until they got a feel for who was signing where. So there's a chance we may use both picks, introduce them, parade them around Waltham, and then send them packing a few weeks later.