There are many references on Google to versions of AtariLink that seemed to be out in the wild. I don't know for sure if it was free or commercial, or if this 2.0 prototype version ever made it to a release.
I did stumble across this podcast interview with Pab that I have to listen to now! Maybe it will answer some questions... http://ataripodcast....genis-developer
there was a 2.0 release