Perhaps F1 is just a model number here? VW certainly don't supply any Formula 1 teams currently, and a 2014 spec F1 engine would have to be a V6, not a four cylinder.
I did some research on the topic and apparently audi was planning to jump on to the f1 game (based on redbulls plans). But sadly with recent VW related issues audis presence in f1 will not happen soon.