Hi,
As far as i know it is relevant to the adapter configuration relavant to Idocs handling in singlestack i.e. javastack...
As there is a new IDoc adapter in javastack which is IDoc_AAE concept you might be looking at is relevant to this...but there is no change in concept of Idoc handling here as well...except some configuration changes again which are relevant to adapter config..but not to do with idoc stuff...
if the above didn't answer your query , please let us know more info...
HTH
Rajesh