Based on the original manga by Hajime Isayama, Tetsuro Araki served as the general director with Koizuka Masashi working on the series composition for the first season.
The folks at Funimation are providing English subtitled interviews and other promotional bits and the latest they have is a nine-minute interview with Masashi Koizuka, the director for the series.
But, you know, imagine if the actual series page listed where things were available instead of it being a black hole of mystery.
The third season of Attack on Titan is underway and promotion for it is definitely been pretty solid.
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Attack on Titan Season 3 - Interview with Director Masashi Koizuka (English Sub)