The german Fansite Dragonage-game.de has made summary about the GameStar Preview.
Here is a quick translation.
Two new companions
-The bald elf mage called Solas who is an apostate and expert for the fade
-The Qunari Iron Bull. David Gaider describes with this words: He fears nothing only the past.
-GameStar saw also an archer (likely Sera)
-The Inquisitor can make his/her own rifts (is it the correct word for Risse) in the fade and summon demons
-No fade puzzles (transformations) like Origins
-Two voice actors for each gender. (I don´t know if this mean 16 for each race and gender or only 4)
-Skyhold or Homebase system. You will also be able to customize certain rooms and buy upgrades, like a garden to grow plants for alchemy. The journalist also suspects that there will be a "map room", where you can allocate troops to open new trade routes or occupy outposts.
-dynamic wildlife. If you kill all the wolves in a forest they are gone for a while. In the same forest another player can met deer.
-new enemy giants they like Darkspawn ogres and throw rocks.
-A dragon is especially vulnerable on the head
-large and beautiful areas
-elaborate tactic camera
There is the link: http://www.dragonage-game.de/