have some big changes in it.
That's... the definition of "save-breaking", loool. Though, in this case it was something about naming conventions, so... not really the reason here. Still works as a fact, though.
And yes, it definitely WILL have some BIG changes, absolutely.
For one, if you are patient enough to GET there - you can now actually play with sort-of Multi-Maps of Space, NOT as added plots on the map, but as SEPARATE PLANETS/AREAS.
As in, you now can have units that TELEPORT to a DIFFERENT Space map altogether - and there's one for each TYPE of Space. Just check the Civpedia for Satellite and similar stuff.
It's bugged (or rather, unsynchronized with the normal map), it's barely implemented, but you CAN use it, it EXISTS - and the very idea is COOL as heck.
And, of course, there's a ton of other smaller changes that had accumulated over the years - I'm pretty sure some aspects of gameplay now ARE different at least to a degree.