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Microsoft on Monday took the wraps of its self-branded Windows 8 tablet, a reveal that drew over-the-top hype thanks to a last-minute, cryptic press invite that made the rounds. We know now that the company later this year will introduce a tablet line called Surface. Beyond that, the event was light on details--there were more questions than answers about Surface and Microsoft's overall tablet strategy. Here are eight key unknowns that Redmond still needs to explain.