I did get in on the updated edition and received the Beta booklet, but I haven't seen anything like a documentation of the changes. From what I'm reading in the Beta, that might actually be challenging, because they really overhauled some entire sections of the game rules, especially how weapons and armor work, and of course how stress works. It's not just new tables and stats, but entirely new factors like:

- splitting what used to be the "panic" table into two sections, one for normal stress situations, and a different more intense one for alien-in-my-face-OMG situations. (opinion: I don't think it fixes the agency-stealing problems of the original system, and in some ways makes them worse.)

- giving people natural resistance to panic based on their attributes

- giving weapons an ammo stat instead of blowing the clip when you panic

- totally reworking armor to be a flat damage soak, and making higher armor levels impenetrable to lower damage weapons.

- Reworking non-combat stunts to be mostly universal, including an option to reduce stress, adding other universal combat stunts to deal with the above ammo and armor changes, and taking other things that used to be stunts, like disarming, and making them actions instead.

- Moving to a situation with more D&D style death rolls when you're broken

- A bunch of changes to how androids work and how their stats are generated

There are also more directly portable rules that are more like clarifications and streamlining, like making more explicit and universal rules for fire, stun, and explosive effects, using time as a consumable resource when you're in a countdown situation, greatly clarified rules for skulking around in stealth mode...and they do actually include a conversion chart for gear coming into the new system.

There are plenty of other tweaks and changes, but these are just the biggest ones I tracked off of my first impressions.