Hmm...this is also the first time in a long time (possibly ever? Memory fails and I wasn't there for the really early days) where we've got Greenskins (albeit weedy Gobbos) physically mutated by Chaos?
Could point to interesting new things ahead. Or two heads. Perhaps even three! Wouldn't be more, because Gobbos can't count that high. Not properly. The old 'boff 'ands, boff feet and yer nose' gets skewed when you've got too many feets and hands and noses.