That's pretty much all, but it does sound like that we will not have to have Walk of Echoes access to get Abyssea.
Trailer, on the add-on site, seems to show both Meriphataud [A] and La Thiene [A], seeming to indicate that we are looking are more "alternate reality/timeframe" zones of what we already have.
Also, introduction of the third mega-weapon set -- and it is basically Magians... The Emperyal Weapons are the third mega-weapon set, and they do appear to be Magian-based. Probably Abyssea, after the current content.
Update IS the 21st -- preparatory update is on the 10th, but no change in game til the 21st.
Abyssea on sale now.