Yeah , unless R2 conveniently waking up ties in with something of major significance it probably will be glossed over. Plus there are many things Episodes VIII and IX need to explain like:
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Rey’s inherent talent for the Force
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Who Snoke is
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The political landscape after the Hosnian system was destroyed
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How Maz got her hand on Luke’s original saber
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Who Rey’s parents are
so something like this is low on the list.