Glad I'm getting this one! (does double check, YUP!). Firstly, I like them all.
Kodiak: whoever said 'atlas' mask, I agree. I hope there's more definition between legs and torso, otherwise it has a 'cut out of a block' look ... So I'd like to see a bit more rounded shape, but not to much ... Like 10% cooler *Rainbow Dash quote* My first introduction to the K was MW2: Ghost Bear's Legacy.
Hellion: Awww I kinda like the WoR look. That skinny frame with some oversized plates. Never noticed how that CT section makes it look like it could have been a LAM (there ya go IH's between the Hellion and the Incubus make some LAMs for your new Scorpion Empire!)
Pack Hunter: Like the Kodiak, it's torso and legs look to 'block-ish'. Not sure about the head, I sure wouldn't want it giving me the evil eye!
Fire Falcon: YES PLEASE! I mean, NICE. It and the Black Lanner always looked odd to me in the art (except for one really good pic). I want to see this type of rework done for the Hoplite! (the 4Bb version makes it look good).
Howler: Chicken walker legs vs humanoid? ... meh, flip a coin. I like the humanoid ones, but these look well done.