Is there any way, or has any one been able to, use Empeg's serial connection to integrate track info in this display?

It could be done in theory, but no one has done it. It would require building a custom hardware interface that emulated the protocol of the existing Audi stereo. Of course, you would have to reverse-engineer the Audi protocol first. And then it would also require custom software to be written for the empeg to output the data to its serial port. This is a lot of work, and although others have expressed an interesting in having the feature, no one has gone to the trouble of actually doing the necessary work.