I'd say that seeing Rey will have a face to face encounter with Snoke could be a spoiler.
There are spoilers, and there are teasers. The scene with Rey and Snoke is the latter, because it's shown without any context of what's happening (other than Rey seems to be tortured). Without knowing what else is going on, it's no more a spoiler than seeing the AT-ATs attacking the X-wings.
I suppose it boils down to if you think seeing any scene from the new movie is a spoiler, be sure to avert your eyes until December!
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