Those who frequent the GW website blog may have seen the pics from the recent "Mega Prize Winner Tour", but did you notice this?
If you look closely you will see what appears to be a new Orcs & Goblins book cover! Don't believe it? Compare it to the current book cover:
If you look at the bottom left of the book in the picture from the GW studio you'll notice the distinct lack of the "Warhammer Armies" font, and what appears to be a large yellowish bit of art. The background of the book is also black or some other dark color and not a bright blue as is featured on the current book.
"Yeah well it is an older book cover" you say. Perhaps ... if you look closely you can see the telltale red outline of the current WHFB army book design and layout, but when compared to the 5th edition book cover for O&G there are similarities.
Notice the yellow spiky bits which seem to line up nicely with the picture from the GW tour (also the Warhammer Armies font is missing).