WotC will likely be making a dedicated Psion class, as per recent tweets

Link to the SageAdvice here:

As I said before, I’d eat my words if WotC said they’d make a dedicated Psion class. While I enjoy the one I’ve homebrewed recently, I’m happy to be getting some official options, and that WotC recognizes that this concept deserves more than just sub-classes to carry it forward.