Famine in Far-Go adds 20 new origins (doubling the total available), more gear (some of it actually useful) and introduces Cryptic Alliances for players. These are kind of like secret societies in Paranoia but less central to the game, optional and only coming into play occasionally. There are about 60 new monsters too, up to level 8. The adventure is a fairly elaborate one for 3rd level characters; by its end they will be level 6.
Legion of Gold adds only 8 new origins, and introduces vocations. Vocations are feat trees, and are the only thing so far that is chosen by players rather than rolled for randomly (though you can certainly roll for them if you prefer). About 20 monsters (level 5 to 14) and a few more gear items are included, but the meat of this one is the setting (the Moon!) and adventure, which fill 82 pages, over half the book. It starts at level 6-7 and goes through about 3 levels.
One interesting thing - all of the origins in both expansions have an at-will novice power. It appears the encounter novice powers were not well received.