No face, no name, no (regnal) number

Move along, nothing to see here, absolutely nothing to see.  William and Kate couldn't be sure about controlling the release of news of the birth, hence the brief statement from Kensington Palace, before the easel display, but they have total control over when the baby will be seen and when his name will be released.  And good luck to them, enjoying their first-born to themselves before showing him off to the world.