The Hound is back! Yes!
I've been thinking he would come back at some point, because they made a point of Arya leaving him still very much alive in that final scene. Plus the episode where he had a trial by combat with the Brotherhood Without Banners and kills Beric Dondarion, that episode dropped a big hint. Dondarion was brought back to life by a Red Priest and he told the Hound "The Lord of Light isn't finished with you yet."
Since they seem to show the Hound becoming religious, in the Faith of the Seven, do you suppose he might end up as the Sparrows' champion to face off against Cersei's champion (his brother The Mountain)? He's also currently in the Riverlands, which is where the Blackfish is. That could result in him meeting up with Brienne, Sansa, Jon Snow and company if they traveled there to meet the Blackfish. Interesting how the plots are beginning to merge.
ETA - and yes, Bronn is back too. Two of my favorite characters: Bronn and The Hound.