@Roger Rambo:
yeah it is the "reallife" Mk VI
cause its a live action trailer like the other trailers sinc ODST
but i think the Mk VI will look like the MK VI in Halo 3
and about Cortana and her hair:
she changed her hair every time a bit....
in Halo CE her hair was extremly short and in Halo 2 the hair was bit longer than in Halo 3