This is yet another case of Hollywood missing the point and attempting to reinvent a character who was defined by his actor and nothing else. Yes, Hitchcock set the scene with a classic movie. But the character lived and breathed because of Anthony Perkins. Unless they've found a way to clone Perkins or bring him back from the dead, this strikes me as a useless exercise and simply a way for A&E to cash in on Dexter.
With all due respect to Hitchcock and Perkins, it's worth pointing out once again that Norman Bates was created by Robert Bloch, who almost never gets the credit he deserves.
It's always appalled me how often Bloch gets ignored or dismissed when the topic of PSYCHO comes up . . . .