Lots of things, but especially this handsome bastard.
Other things:
- multiple playable races.
- they finally struck gold with the elf faces (not easy to mistake for human as in DAO, more realistic than DA2. Still unique and clearly elven).
- the way companion armor was done. Everybody had their own distinct style, but there was variety.
- qunari ladies actually look like they could break a man.
- AVVAAAAAAAAAR. Morvan! Sky Watcher! JoH!
- Skyhold was amazing (I'm comparing it to our sad little "estate" in DA2...)
- interactive banter.
- nudity where and when it's appropriate.
- our companions were wonderful, but that's true of every game in my humble opinion.
- a love interest who wasn't a human or elf, for once.
- LOSING AN ARM. I was thrilled. It's about damn time all this constant adventuring and fighting took its toll on our protagonist. I can headcanon my Warden losing an eye or Hawke having a bad knee, but this is so much better.
- Sera's journal entries.
- NPCs hooking up or crushing on each other if the PC has eyes for someone else. Makes them feel like they're not just there for our convenience.
- coarser language. I talk like a drunk redneck pirate, so I appreciate it when not every single person talks like their grandma's watching (

). At the same time, you have diplomatic characters who are unfailingly polite.
- The Descent. Because dwarves.
- romances without obligatory sex.
- more interactive environments. Climbing ladders, jumping off cliffs...
- a protagonist who's allowed to be awkward and unsure at times.
And many other things, but these are a few off the top of my head.