I have a feeling there is going to be a big effort on the Cavs end to rework their roster whether Lebron re-signs or not. I don't think Mo or Delonte (Delonte especially due to his expiring) will be ob the team next year. Hickson or AV may be moved to bring a big name player as well (if they can swing it)
The problem is that the Cavs' options are severely limited, aren't they? Delonte's partially guaranteed deal is a trade chip, but that's only $4.5 million. How do you bridge the salary cap to bring in a star player?
Mo and AV might be options to be traded, since they're both talented guys, but they're also both on long-term, fairly expensive deals. I'm not sure how much value they'll have in this economic climate. Generally, if a team is willing to trade a star player, it's for non-guaranteed deals or elite young talent. The Cavs don't have either right now.
A trade at the deadline could be more realistic, as the Cavs do have a handful of expiring contracts. However, I wouldn't expect any big trades in the summer.