I got one code left and not sure how to give it away. If you want it, post why your excited about DA: I and make it more than just 1 small sentence. We must show our love for DA!
I'm excited just to experience the world of Thedas again. It's an amazing and beautiful place full of amazing and interesting people 
I'm excited to be able to play as an elf, dwarf, and qunari. There is so much story potential there, especially in the player's interactions with the human-dominated world.
I'm incredibly excited to romance Cassandra
She's a beautiful, fierce, and dedicated woman who is discovering and must confront the complexities of the world. I want to be the one who comforts her, even if she pushes me away at first.
I'm excited about the new classes, especially for the mage and rogue. Rift Mage and Tempest, based on title alone, sound awesome!
I'm excited about the Inquisition! Personally, I've never played an RPG in which I was the leader of a band of "plucky upstart rebels" (as Mike Laidlaw described it). It seems like there are many story and gameplay facets that will make the Inquisition memorable to players for years to come.
Mounts! I can't wait to ride a nug-water buffalo thing! 
Cole, Solas, and Sera! Besides Cassandra, these three have already become my most favorite characters in Inquisition. I respect Cole's pursuit of purpose in a world that fears, shuns, or forgets him. I respect Solas' moderate views of the world and his unique perspective of the Fade. I respect Sera's contempt for authority, as well as her attempt to find humor in the darkness and chaos surrounding Thedas.
I'm equally as excited to interact with Morrigan and Leliana. Morrigan was my love interest in Origins and she seems to have an intriguing arc in Inquisition, as does Leliana.
I'm also excited to explore (part of) the Dales! My main Inquisitor is a Dalish mage, so that will be an important experience for him.
Finally, I'm excited about the multiplayer, mainly because it will allow me to fight alongside my girlfriend (assuming I get a PS4 because she is on that console, but I'm on PC
).
EDIT: Thank you so much, Wissenschaft!