Honestly, Snoke being around during Palpatine's run is not believable to me. Palpatine had to have known about another strong in the force. Clone Wars showed us the lengths he went through to uproot and destroy anyone who would challenge not only his superiority in the force but also the rule of two. Also, if Snoke is more powerful than Palpatine was, which I doubt he is, why did it take Palpatine's death for him to rise to power?
Snoke had to have been trained by someone, but who? His backstory better be believable and interesting. I hope we get to see him in action as well.