I don't know for sure, but tehre was supposed to be a GOLD version of this game that would include dynamic campaign. Is this the one GOG has on sale? Or is it patched to it, or none of the above?

I suppose you mean the Officer’s Edition. That edition includes The Albanian Campaign (20 missions more) and multiplayer but it isn´t offered on GOG.

Hmm, perhaps it was ditched, because I remember reading about the dynamic campaign system that was going to be eh added, with a patch. Oh well.
Thank you for answering.

It wasn't ditched. It's out there, but is very difficult to find it

Do you mean this? [url]http://www.amazon.co.uk/18E-Super-Hornet-Albanian-Campaign/dp/B00005B0YT[/url]
I found it locally in a bargain bin for 1€, which is largely the reason I haven't bought the GOG version.

Nope. As Daedolon said the only expansion released for F/A-18E Super Hornet was the Albanian Campaign-mission disk. This however was not the expansion which was promised by the developers Digital Integration to include a dynamic campaign.
The studio was acquired by the publisher Titus Software during the development of F/A-18E Super Hornet. Titus itself then got into financial difficulties after completion. They released the Albanian Campaign or 'F/A-18E Super Hornet - Officer's Edition' and shortly after that closed down Digital Integration.
At what status the dynamic campaign was when the studio was folded or if there ever has been one... no one knows except for the former developers. However there has never been a release of the dynamic campaign system.