For the first time since the end of July the front two months of the VIX futures are in contango, after spending 1 1/2 months in backwardation.
While the degree of contango is very slight at the moment, this means that the short-term inverse VIX futures ETPs (e.g., XIV) are now benefiting from negative roll yield, while the short-term long VIX futures ETPs (VXX, TVIX, etc.) are no longer receiving the benefit of positive roll yield from backwardation and now face a slight headwind.