I think that you might be able too because i think i heard from some magazine that they still had a secret game mode that would kinda be like online co-op thingy with objectives and one team would be covies and the other Spartans. they also siad there would be a coive that could climb on walls. I have no idea if this info is correct so don't take it too seriously
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Who said anything about playing as the elites specifically, he was asking about covies in general. You could end up playing as the brutes, or maybe a new race perhaps? *gasp, shock, horror*