- last post: 01.01.0001 12:00 AM PDT
Both. ... are possible.
Remember that trailers of games that aren't made yet don't show gameplay as much as they show the environment, sort of a -blam!- tease, to get you aroused and aware of the game.
Although a Spartan player would be more fitting and can make for some pretty epic moments a.k.a. spartan deaths (CoD4 nuke anyone?) An ODST would create a sense of awe and reliance on the spartan characters, although a customized marine ala Mass effect would be even more so.