Dragon Age Keep is just a fancy thing you can use to customize a story.
But it will also use your saves in the game also when connected to the servers.
But your DA2 playthrough is not wasted, DA:K will pick up on the achievements done on DA2 also, and you can fine tune it on Keep or just use the save when logged into Inquisition.
[Edited by DABhand, 11/2/2014 9:01:07 PM]
You can choose any of your charater in DAO and DA2 to form a "World State"
That will then form a "base" for your game...
DAK will be open to all (that is what they said), as "DABhand" said, u can tweak in DAK
to do a whole new "state" takes about 10 - 20 mins, i have done 4 sofar... (i am a BETA Tester)