The other hunter is also a Vho, just like Noxus. He isn't Noxus but is another of his species. Whether or not he is an ally or enemy of Samus is unknown. Inclusion of Hunters as little references are a nice idea. Like the little tidbits Nintendo put in their Zelda games.
After the talk about the Metroid series, I had forgotten all about the side-scrollers. I had just presumed that 3D = First Person and 2D = 3rd Person Side Scroller. What path will they take next? I can't see them using the 1st person again any time soon after Corruption. At the same time, I've come accustomed to side-scrollers being on handhelds even though Super Metroid wasn't.
agree with Darkflame, the dark world in Echoes was unbelievable and executed so well. I loved it.
It was way too purple and it didn't vary your surroundings all that much. The weapons and enemies were nearly fully recycled from Prime. While Prime 2 did offer the Luminoths as some company, I wasn't satisfied with it. Therefore, in Corruption I look forward to the more modern-looking, populated surroundings.