I believe just a rando since, apparently Uatu is with Fox
I don't know, I vaguely recall an official listing that had the Watchers, collectively, as one of the confirmed things in the Fantastic Four contract.
Anyway, some things I wonder about:
1. Ego as a Celestial- does this mean that the giant armored critters shown in the past in GOTG1 *aren't* Celestials? Or was Ego just wrong/misinformed/lying about him being the only one of his kind in existence? I mean, note, "lying" is totally an option, since his own conclusion about purpose to existence was "I need to replace everything with myself". Could be the other Celestials just came to different conclusions about their purposes.
2. With the Collector introduced and the Grandmaster coming, I wonder if they will eventually reveal any connection between them? Will the Elders of the Universe actually be a thing, or will they just be unrelated, non-cosmic aliens? I know its unlikely, but I'd be amused if they were revealed to be cousins of Ego, of a similar "species" but not as old and powerful. . . or perhaps something similar to *Peter*, except much older and grown into their own personal power.
3. The Ravagers- my theory? The mainstream Ravagers started out as, and probably largely remain, anti-Kree privateers and freedom fighters. They are rogues and pirates, but the more decent and heroic type, as compared with Yondu's fallen ones who were much more amoral and selfish. After all, the Kree Empire was ( and apparently still is ) pretty terrible, and until very recently was at war with Xandar ( and likely much of the rest of space ). Seems the perfect fodder for a heroic lawbreaker set to arise.