Origin is currently gives away 'Dragon Age Origins' for free, but with no DLC included.
As for Keep - I'm not sure which one is safe to tell. 
It does look great and promising.
It has cool art and an option to hear\watch a short summary movie(voiced!) based on your own tale about the events of DAO+DA2. Plenty of variables and flags are already involved, and they keep adding more. Some of them were really unexpected, to be honest. I have no idea what impact they may (or may not) have on DAI PT, but they are in the Keep.
All the major plot choices are there too, of course. Romances included.
I also had a feeling that some of those flags are impossible to import from the previous DAO-DA2 PTs, but it could be just me having trouble to figure how could they possibly know THAT about my Hawke\Warden?
It is connected to the Origin account, and one can share his\her world-states with friends. All of you who had friended me - I can already see you all on my 'Keep friends' list.
It's possible to store several of those states, but we don't know yet whether it's possible to change them 'on the fly', my guess is that it's only possible to pick one as you start your DAI game, but I might be wrong about it. Old save files are not involved (which, I believe, had already been stated, so I'm not breaking anything by saying that).
I could probably answer some questions (or may be not, depends on questions).