You probably know this already, because if you own these books on PDF you'll have received an email offering up a link to the latest versions of the files.
That's trickier. According to the forum post linked in the update email alert, there were "minor errata and tweaks throughout."
Err . . . like what? Did any numbers change? Point costs? Page references? Important verbs? Semi-important nouns?
It's annoying that I get to know something changed . . . but not what. Especially since I still, quite often, use my harcopy books for rules reference. SJG used to list the errata by item. If they're still doing so for this update, I'd like to know where. Does anyone reading this happen to know? My favorite game system isn't going to change just because I can't find it, but it's annoying that I can't put a finger on what changed in the basic books underlying the whole system.