benn--
You really ought to read further on the FLAC site. The format is described exhaustively and defintively. Myself, I have trouble operating my TV remote, and yet after studying the FLAC description, I felt empowered with all the expertise necessary to listen to and enjoy a song encoded in FLAC.
To answer some of your questions: Yes, songs have version numbers. If you select one of your FLAC files in MC and do a tag dump, you will see the FLAC version # and a lot of other really obscure stuff. It is in reading the version # and some other tags that the playback machine is able to make sense of the data format, and switch seemlessly between Encoder versions.
So no, you should not immediately re-encode your FLAC tracks in the new format, although there is no risk to your data in doing that. Josh just might be a little over-exuberant regarding 1.3--apart from internal album art, the changes seem more of the green-eyeshade variety to me. I have tracks in FLAC 1.2 and 1.1 and they sound just fine and playback perfectly in all of scthom's decoder versions, including the latest, which supports version 1.3.
You know, benn, it's times like this that I regret the lack of a forum PM function. It was disabled recently for security reasons, and at the time Alex B argued strenuously that it ought to be preserved for communication between registered forum members. For once, I accept his (knowledgeable) advice without argument.
You see, Alex B is an recognized expert on digital audio tagging, among many other things. If the forum PM function were still enabled, like he argued and argued for, you would be able to PM Alex B with all your questions and follow-up questions. And not just on tagging, don't forget:
--Lossy file-format compression schemes.
--CD recording standards (Redbook).
--Digital audio theory.
--What an elephant looks like sitting on a toilet.
It's that last bit of expertise for which I also would like to PM him, but we all have to take life's opportunities as they're presented. So good luck, benn. maybe if you Googled "Alex B" you might get some further clue on how to send all your important questions to him. He's mentioned he lives in Finland, is that anywhere near Iowa?