In terms of the whole light versus void conflict I personally hope we remain as Horde and Alliance. Yes it would free up player choice but I think it would take away from that Warcraft feel if masses of Orc's were trolling around Stormwind. Although I know it won't happen I really hope this whole Void vs Light thing is a slow burner rather than something that we deal with in 9.0 or 10.0. I like the fact that there's some mystery surrounding it and it would be much more satisfying to see it have a really long arc rather than jump into it right away.
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As much as I would love ogres I think I would prefer subraces and more customization more. WoW is severely lacking in customization at the moment.