Sony recently announced that Japan is getting a Metal Slime PlayStation 4. The slime is based on a character from Dragon Quest series, to celebrate the release of the upcoming game Dragon Quest Heroes. The smiling blob on the front is a removable USB cover.
Sony hasn't revealed when the console will be available in Japan, or if the console will ever be available in any regions outside Japan.
Currently, the PlayStation 4 is only available in the standard "jet black" color. Though Japan does also have a black model with characters from Disney's frozen etched onto the top portion of it. However, the "glacier white" model is being released on September 9th as a part of the Destiny bundle.