It seems pretty clear the guy is wearing stormtrooper armour as it's been redesigned a lot. I doubt the film makers are going to be drawn into making many specific statements this early, that's the point of a teaser.
The arguments about him being black are rather silly. Firstly we don't know the circumstances in which he may be wearing the armour. Secondly, the first clone army was made at least 50 years prior to the new films and in Attack of the Clones the cloners say it's all been paid for, which might imply that they are not a continuous production. Anyway, it's more than conceivable that it's open to non-clones as even Luke and Biggs were expecting to join the imperial academy as pilots in New Hope.
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