The beauty is that all they would theoretically have to send to get him is Keith Bogans and his contract. Then Dallas would not extend the contract and dump the salary outright. It would be win-win.
Rudy Fernandez has not been the shooter he has a reputation as being, but he is a good shot-creator and would be a nice addition on the Bulls—particularly if they could get him in a deal that makes Dallas look like they overpaid to get Lamar Odom.
Defensively, he's not the strongest guy in the world, which is the nice way of saying he gets overpowered by point guards, but he is quick and would probably be able to be marginally successful in coach Tom Thiboeau's system.
There are no reports, though, on whether this will happen—whether Chicago has inquired or, for that matter, who Dallas is talking to.
Since they would be giving up literally nothing, the worst that happens is they can always just trade him off at the trade deadline if things aren't working out.
The Chicago Bulls, at the very least, should make a phone call and run the notion of a Bogans-for-Fernandez swap.
Incidentally, in other far more dramatic news, the Chicago Bulls re-signed Brian "White Mamba" Scalabrine today, according to NBA.com. Why do I suddenly have a craving for a Big Mac?