Let me first say that I absolutely HATED his play his first three seasons. However, last season he made tremendous strides in refining his game so that it was more efficient and team-friendly. He used to be an absolute black hole but no more.
I haven't heard much regarding Tyreke at all, and I believe it's because there really isn't a market for him. After his gorgeous statistical first year, the flaws of his game really came out, and his value tumbled. There's absolutely no reason the Celtics shouldn't be checking in on someone who could prove to be a bargain.
That being said, when examining his potential impact on the Celtics, it's very tricky. Tyreke is versatile and can play PG, SG, and SF. However, even though he's less of a black hole now, he still operates best with the ball in his hands. He's most dangerous driving in and collapsing the defense, and not setting up for the perimeter or mid-range jumper. Shooting is not his strength. Given all these points, I really question the effectiveness of putting him alongside Rondo.