I like the Horizon Walker. It looks really fun and interesting. And, it even keeps the "border patrol" fluffiness I like from the Ranger. I'd play one.
The Primeval Guardian isn't really my cup-o-tea, but I don't hate it. I'd probably allow it as a PC. I might encourage something else, but, if they were set on it, I'd be fine.
There's no need for a Scout kit for Rogue; just choose the right background and skills..... Oh, wait.... That's actually kinda interesting. I see where some of the cool, but broken, ideas (like Ambuscade) from previous UA Rangers went. Nicely done.