Inside Mac Games found a thread in the Freevserse Forums where the company responsible for the Mac Port of Heroes V says that it has received the code for version 1.5. Work on an update for the Mac is therefore in under way, but the process will take some time:

"We have to integrate it in, make sure it works. Then once all of that is finally done. We have to get it approved. We then have to get any release PR approved, and only then can we release. It's not going to be a fast turn around."

It sounds like the Mac gamers will have to be patient, once again.