Yeah, this is simply one of the best TV shows ever made, obviously, it's only one season, but I'd say it seriously rivals Breaking Bad, easily the best new series in a while. The season finale was ridiculously good, Matt & Woody killing it, and Rust's monologue at the end is fantastic.
Season 2 pitch given by Pizzolatto sounds intriguing & yummy, although there's one thing that I fear, more like two things: without Matt & Woody, it's going to pale, and I think that regardless of any great actors they cast, it's going to be very hard to make it as compelling, second: the director, Fukunaga I think was a big part of what made it so great, the news that there might be several directors (like all tv shows) for season 2 is not a great one, although not surprising as it's a lot of work.
Jeff Nichols would be my number one choice for season 2, he just excels at this strong sense of place stuff & developing strong characters, he's got a great visual sense as well.
For the actors in season 2, I just hope and I know it's going to sound very misogynistic, I hope that there won't be a female detective or something, I would hate for Pizzolatto to give in to some of the complaints against the show that it's all about the men, and etc, and I agree, I personally (my opinion) never find female characters as compelling as men's, there's a reason why male characters are so prevalent overall.