The build definitive still has interface issues, like subtitles in cutscenes being shown under the 16:9 black border (lol) or that the mouse doesn't correctly point on interface elements in the hacking screen, etc. But overal it has a pretty good quality already--- Not a big surprise, though, as it's a press preview build and imagine they would send the press some buggy ass****.
I really thought DX3 will be bull****, but so far it has convinced me. Have to say that it seems like there isn't a lot story progress in the first 10 hours, though. You are mostly running around, searching for clues, etc. It's pretty much the buildup for some bigger conspiricy. It all reminds quite a lot of Hells Kitchen and Deus Ex 1. Most likely the devs took lots of inspiration here, to make it feel like a follow up to DX1. Now the real question is, if the games quality will hold on even after the preview build part.