So far they've confirmed you can play as an ork, chaos marine, space marine or eldar. There will be vehicular warfare and will be a third person shooter. There is pre-alpha gameplay everywhere and looks fun, but it's nowhere close to being the final product. It's set to release in late 2015. Here's to hoping it doesn't require monthly fees.
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Pre alpha? I'll say [b][i]late[/i][/b] 2015 early 2016 for it then.