Got a few hours in with Shadowrun: Hong Kong, and so far the verdict is very good. It looks like it's improved over Dragonfall much in the same way Dragonfall was improved over Dead Man's Switch; fixed some issues, smoothed over some rough edges, and added in a lot of new stuff. If you liked the previous games, no reason not to get Hong Kong.
Just wrapped up my first play-through of Shadowrun: Hong Kong. I completely agree with Antilles assessment on the improvement. My only quibble is that I can't ambush things in the Matrix like you can in meat space. The story is well written and I found the ending satisfying. It might have been a little easier than Dragonfall or perhaps I've played enough of this type of game that I'm better at it. (Sure, we'll go with that.)
I have a review of the game on my to-do list so I may update my post later.