Currently you can have a free wow account that lets you play characters up to level 20, with a 10g cap and several restrictions on the use of mail, auctions and social features. I don't recall Blizzard mentioning this system during Blizzcon, or how it would change with the level squish / new intro experience, but maybe I just missed it.
Was there any information put out on whether a f2p option will remain, and with what restrictions?