So nier reincarnation revealed how the planet of aliens used to look like

As "her" mentioned, she made this facility after the machines creator's planet

After she fused with N2, well it looks majestic I still don't know what happened to 2B or 9S Or who are those androids that woke up while they are the only 3 left on earth alongside with A2

But there was some alive androids in side quests in nier automata like 4S

But most of it is still a secret, well atleast we got any new info regarding the aliens so far.