EXPECTATION() operator and restricted information set

Dear Musketeers,

DynareWiki gives (dynare.org/DynareWiki/AuxiliaryVariables) an impression that it is possible to have different information sets in the model. Namely:

Where I can find more information regarding the idea and the syntax of the command. It seems that manual is mute about this?

Dynare 4.1 release says (about EXPECTATION operator):

Is it still under construction?

Best regards,