At the end of The Force Awakens, Supreme Leader Snoke said that he was going to complete Kylo Ren’s training in the dark side of the Force. I have been theorizing what this training entails and I have some ideas. It has been confirmed that The Last Jedi is going to take place right where we left off in The Force Awakens. Due to the time frame of events, I think whatever Snoke has planned for Kylo Ren will be brief and instantaneous yet powerful and significant at the same time.
In The Clone Wars, there were beings who were incarnations of the various aspects of the Force (the light, the dark, and everything in between). In Legends, these beings were revealed to gain their power by drinking from or bathing in two extremely powerful sources of Force energy. This gave rise to the dark side entity known as Abeloth, who I suspect Supreme Leader Snoke is based off of. If such nexuses in the Force exist in the new Canon, then this could be the source of Supreme Leader Snoke’s power. It would also be what was calling Emperor Palpatine from the Unknown Regions.
One possibility could be that Supreme Leader Snoke intends to connect Kylo Ren to a nexus of dark side energy in order to augment his power and permanently eclipse the light in him. If that happens, then Kylo Ren could be worse and more powerful than his grandfather (Darth Vader) ever was. That would be a scary thought to consider.
Another possibility is if Supreme Leader Snoke has a way to implant dark side knowledge directly into Kylo Ren’s mind. Supreme Leader Snoke obviously trained Kylo Ren to drain knowledge from the minds of others. Due to that same principle, Supreme Leader Snoke would definitely know a way to do the opposite and transfer his dark side knowledge into Kylo Ren (or as much as he will allow).
I cannot wait to find out what training methods Supreme Leader Snoke will utilize with Kylo Ren. Either way, this will give us a clearer view into the philosophy and ideology of the Knights of Ren and how they differ from the Sith.