ETERNALS #4 - NG & JRJR - Out today . . .
Ah, so that's what's going on.
This issue basically explains what's going on here, amnesia-wise. It's all Sprite's doing. Gaiman does a riff on the Eternal Youth thing (ie. how much it would suck to never grow up) and most of the issue is Sprite explaining the goings-on to Makkari. The rest of the cast doesn't get a whole hell of a lot of screen time, with Druig, Sersi, and Thena rediscovering their powers.
So, the skinny: Sprite, sick of being eleven years old since the dawn of time and corrupted by the Dreaming Celestial, reactivated clones of Zuras and Ajak and used them to form a Uni-Mind powered by the Great Renegade. He used that Uni-Mind to change reality so that the remaining Eternals became human and forgot who they really were. Parallel to that story, Ikaris wakes up. His body has been cloned by the machines of Olympia and his soul is reattached to it. The computers of Olympia tell him what's going on, and he goes to find Thena so they can stop the Dreaming Celestial from waking up.
Honestly, this is my favorite issue thus far. Great art, a great explanation for everything (including Ikaris's faulty recollection in #1), and, best of all, no Civil War!