The Court of Appeal decided yesterday 13 November 2018 that it does have jurisdiction to determine an appeal on points of law against the dismissal by the Competition Appeal Tribunal of the collective claim by Walter Merricks against MasterCard. For the background, savour http://www.breakinglaw.co.uk/search/label/MasterCard%20claim
So an appeal will proceed in due course. Before Christmas? Come off it. I'll keep you posted.