There's still a chance we're looking at an elaborate KIRF or an early engineering prototype that could change, but given that 9to5 Mac just got very similar images with black trim, there's a real possibility that we've just been given a sneak peek of what to expect from Apple later this year.
Mr. Wheeldon's Alice sports atrim, brown bob more akin to the hair coloring of Alice Liddell, Lewis Carroll's real-life model for the titular character rather than the long blond tresses made memorable by Tenniel that inspired Disney's animators.