I dunno, I'm rewatching TFA right now and Rey's parents are a pretty big mystery thats brought up and never really resolved. Rey herself is super mysterious and I feel like her past is definitely going to be a big deal at some point.
I'm also still convinced that Rey was at Lukes academy when Kylo attacked it but he couldn't bare to kill her for some reason, erased or muddied her memories and put her on Jakku. He clearly knew who she is ahead of time. which iirc is made very apparent in the novelisation.