I haven't played the beta yet, beyond creating characters with my group, but I've already found some peculiarities in the rules. Reading this thread, I found some others have had similar thoughts in the past.
The Specialist talent seems a bit...unevocative of the setting. I wanted to have a Sage who's read some tomes he wasn't supposed to, and took the Specialist (Daemons) talent, but when I read the rules for it, they basically said: "You speak every daemonic language there is, you know how to heal daemons and you know how their infernal machines work."
That seems a little too...easy for a starting character. Daemonic languages and forbidden lore have always been somehow hard to acquire in 40K, so just bluntly saying you know them feels a little too much.
Now, we're having the first session of our beta test campaign later today, so my opinion might change, but for the moment it feels a little too blatant.
What do you think?