That promo looks very cartoonish with the colouring and brightness. Perhaps that is the point of it. It is a little annoying.
It's made from Phil Noto's cover for #6, but the coloring is even weirder than in the released cover image.
So just beware if you click on it. It is however not some leaked info, its an official release. And its a cover image for #8 so you'll see it before you read the issue anyway. But just for here and now I'll discuss it in spoiler code
Yeah, but we're actually supposed to only see it after we've read #5, 6 and 7. We're getting spoiled a lot because Dark Horse releases solicitations and covers for 4 issues in advance. Though some of the solicitations were misleading (like the one for Buffy #4). Still, I'm not clicking on that...