From what we've seen, I believe the graphics are improved. Words like "better" don't mean much in a conversation about visuals, however. There are the graphics in a technical sense, and then the art direction, and graphical features I suppose- all of which I believe are improved. DA:0 did lack a signature style, and that certainly has been remedied. People may complain about the textures on Sebastian's armor, but I would point out that (1.) they're much better than the worst I can remember in Origins, and (2.) Hello, but he's wearing a completely original, custom outfit, designed solely for his character. If this was DA:0, he'd likely be in leather armor similiar to Zevran's, and I'll take his white and gold outfit over that every day, regardless of textures. Add in animated elements to outfits, dynamism in the environment- such as Eltina's interaction with his posting in his reveal video, and you've got a large step up, in terms of presentation.
Blabbering on. We've still seen very little of what promises to be a huge, complex game- and you can only tell so much from screenshots.