Here's how you get the fashion conscious dromaeosaurids to appear:
Go to Vogue UK.
Now, type the following key sequence:
up, up, down, down, left, right, left, right, B, A
RAPTORS! IN HATS! (They come at you right to left across the bottom of the screen, before disappearing.)
It's been happening for a couple of days now, so no, it's not a hack job.
Enjoy it now, because once Vogue reveals what it's about, I'm sure the result will be nothing but massive disappointment.
A tip of a stylish hat to Adverve.