Imagine the aliens meme guy with the text :spacetech: + :money: underneath.
I'm a little wibbly on the realism of that much happening overnight (though, to be fair, I don't know how long it takes to hatch a station egg) but it's probably safe to guess that smaller, less visible work was being done in the background, unseen, and that the "last 24 hours" was a special rush for the visible, cosmetic fixes.
Jace: there's a reason I patched my TQ client to Sisi last night when I went to bed. Logged into TQ this morning instantly with no patching. :3 (Also, there were more graphics assets than just the remodeled stations and Crucifier and Nestor hulls - every object in the game with a rendered icon now has its icon included in the client rather than being rendered on the fly by the user's hardware. That's a lot of icons.)