After you purchase the core box of the game, check the FAQ, to make sure what printing you have in your hands.
The box might contain some extra, errata cards, and there are instructions in there on what to keep. You might have all corrected cards already, depending on the printing, I believe.
After that, getting FA: as far as I know, there is only one first printing yet, so if you buy it (even though FFG recalled FA from stocks around...) the game will contain errata for the core box, which might end up being just duplicates since either your core box will be already all corrected, or maybe not.
So to simplify:
- open the core box, check the online FAQ to make sure what to do;
- open FA, and use the errata there.
Independent of this, if you currently get FA, check FA's FAQ, there is a bunch of things that need errata and are waiting.
If you buy FA, you can email FFG which will send the corrected things to you once they get it done (as far as we all know, the errata is not ready yet)
Dont buy FA, wait for FFG to announce it was corrected... then make sure you buy from some store that has the second print...