Romances confirmed so far: Cassandra, Cullen, Dorian, Josephine and Sera (Iron Bull?)
Mage specializations are: Necromancer and Knight Enchanter. There will be a third one, but it has not yet been confirmed.
You will no longer directly import from any of the games. DA:I will launch with acces to a new feature called the Dragon Age Keep, which is a website that allows you to set the various world states for your future games. That means any choice in any of the games that will have a future impact on the world, will be an option to toggle ona nd off (and how you handled them).
Each different race (and possibly class) will have a unique background. However this time around you do not play an origin story.