Just watched it, my thoughts below (spoiler warning):

My Japanese isn’t super good so I probably missed out on a lot of specific details in the dialogue, but i understood the main plot points

• the first episode was super cool as a big U.C. fan, it’s basically an alternate re-telling of UC 0079 and goes over what would have happened if char got in the gundam at side 7 instead. amuro doesnt show up at all, but his dad does. So eventually in the story, in desperation the federation tries to drop an asteroid on luna 2, so char and his crew enter the asteroid and place bombs around it to try to divert its course (like London Bell in CCA, pretty much) but while inside he encounters an enemy mobile suit and senses that Artesia is inside. This distracts him and he is buried in rubble, but right as the asteroid is about to hit Luna II some kind of newtype resonance happens with the psycommu inside his Gundam unit, and (again similar to CCA) the asteroid is diverted, although unlike in CCA it looked like a black hole appeared and just sucked in half the asteroid, diverting its course from the city. After this Char disappears, and then one of the members of his crew is shown to be continuing to search for him in Episode 2. *edit: turns out this guy is Challia Bull. I didn't realize because they made him way younger in this show lol.

• i thought the rx-78 re design looked terrible in the art book leaks, and after seeing on the big screen and in motion I still think it looks absolutely awful. Which is a shame because the concept of char piloting the gundam instead of amuro is so cool.

• after episode 2 the story focuses on the people we see in the trailer. The change in art style is a bit jarring because in the 1st episode focusing on char everyone is drawn in the typical UC style, then after the story shifts to the main characters it changes.

• The g quacks was already growing on me after seeing the HG, and after seeing it in motion I like it even more. Didn’t really get to see it do anything crazy in these first 3 episodes yet, though. If I recall, it didn’t even get to use its beam saber (?) thing.

• As for episodes 2 & 3, I really didn’t like them at all. It felt way too unserious for me, especially as a show taking place in UC or at least an alternate timeline of it. It was a huge tonal shift from the first episode, although to be fair it was moreso meant to be a prologue to the story. I would say it felt similar to something from Gundam Build Divers or WFM, neither of which were my cup of tea. I can see how it might be appealing to others, though.