It's definitely looking like they're setting up Galgo to be the next Machiko Noguchi, and if the series does well he'll probably be returning to have more adventures. I hope he's at least an interesting character. Some of what Williamson has said has made it sound like he might just be another generic, out-for-himself mercenary type. But I won't prejudge that too much.
As far as the Predators go, I guess I feel the same way, but in my case it's the Xenos and Engineers I'm worried about them changing. My guess as far as the Preators goes is that there won't be too much new info except some stuff about their relationship with the Engineers. On that count, I don't see DH doing anything major with that, due to studio restrictions.
Not necessarily new, but Patric Reynolds, who is doing the interior artwork for the Aliens series as well as some of the promo images we've already seen, just did a Tumblr post dedicated to his Aliens work. There were a few images I've never seen before, but I'm pretty sure they're from that Colonial Marines tie-in comic he did a few years back. Either way, it's still an interesting look at the style we'll be seeing.
http://patricjreynolds.tumblr.com/
