Vince Vaughan has been confirmed and the director of the first two episodes will be the guy who made The Fast & The Furious 6! Gulp!
Yeah the Justin Lin directing thing is a bit worrisome at first but there was a quote by one of the HBO heads that said the first two scripts were "more exciting than the first season". So I'm guessing they are hiring an action director for good reason.
Also the show runner is the overseer of everything and I'm sure has can direct the mood/character moments. Plus it's the same cinematographer as the first season.