Some of the parts of the brutes look extreamly low res, I wouldn't be surprised if part of the textures was stand in stuff. They did the same thing with the ship noble 6 flys into space, take a closer look at it, it looks half finished. I'm thinking these brutes have yet to see some nice shiny paint, and you would be surprised what a good coat of paint can do.
EDIT: For anyone that didn't watch E3 live, Kat is voiced by a russian, and sounds awesome.