Attack on Titan has no dub I think. link
I don't think that they will unless it s licensed. Info on Wikipedia can help to tell you if they licensed it.
.......still airing anime has no dubs yet..... -_- .... its not like dubs are magically created the moment a show comes out... you can watch it on crunchyroll.com, or just wait until it's over in like October, and see if anybody wants to dub it, and even then it might even take a year for it to get dubbed and released on dvd
I agree with your answer about new shows and how they're not magically dubbed. Thanks for explaining that, I couldn't think of the right words to say it. xP
As the others have said, Attack on Titan is a series still being made; therefore it doesn't have any dubbed episodes just yet. Have no fear, though- Funimation has liscensed it, so we won't have to worry about unreasonable prices on the anime DVDs (I'm looking at you, Aniplex...)
For now, you can watch on Hulu, Crunchyroll, and other anime- related viewing websites! c: