Re: Pen-y-gors
They've dropped it because they can't proceed without physical access to him, which they are unlikely to get.
Though he had been interviewed in the presence of a Swedish prosecutor at the Ecuadorian embassy on 14th November 2016 -
http://www.voanews.com/a/sweden-gets-written-report-from-assange-interview-in-london/3664245.html