During this storyline, Tempest and Dolphin acted totally out of character, to the extreme of them having a shotgun wedding. Dolphin's pregnancy was drawn out into Aquaman #63, where the next writer had to deal with it.
The other major change was that Aquaman's hook was immediately replaced with a mysterious and never explained cybernetic hand which he suddenly favored over the hook.
All the important information you need from the run is on this page.