CBS is keeping its cards close to its uniformed chest as far as storyline details are concerned, offering the following:
The brand-new Star Trek will introduce new characters seeking imaginative new worlds and new civilizations, while exploring the dramatic contemporary themes that have been a signature of the franchise since its inception in 1966.
So - 'new characters, new worlds and new civilizations' would rule out a rehash of any previous series (which is a good thing) and makes a station-based series like Deep Space Nine very unlikely.
As for 'dramatic contemporary themes' - looking for a new home for humanity? Exploring distant worlds just for kicks? We can't wait.