I'm surprised at this trade, because I hadn't heard any rumors, but I like it.
The trade for Lee was a good one when it was made—Danny got creative to acquire a shooter to help KG and Pierce on one more run. That plan didn't work out and has since been scrapped for a new (rebuilding) plan, and Lee didn't quite fit in with that (at least, not with that contract). Today's trade saves the Cs some money this season, but more importantly opens up cap space over the next couple seasons.
I like Lee and wish him well, but this is a good step for a rebuilding Cs team.