I shouldn't be here, so I'll be very swift! Love the Hamlet comparison, but I think the main shift in Moffat isn't that the Doctor is unknowable, but that it's no longer the Doctor who is on a journey now, but the Companion(s) - the Doctor is the enabler, the wizard, the guide, and his 'unknowableness' comes from this change in character function. This is why I love 'Space Gandalf' so very much - he's not Frodo any longer (another good Ten-parallel), but the one overseeing the journey. :)