I can confirm for you all that HighSchool DxD WILL BE GETTING AN ENGLISH DUB!!!!
This news comes from Australia, Madman [the anime/manga distributer for Australia that rarely releases anime that is not bilingual] Announced on Sunday the 19th of August, that they had licensed 9 new anime for release in Australia including HighSchool DxD. Upon this news i decided to ask on their facebook page about what kind of things to expect "Dub, Cast, BD" and heres their response direct from the page
Madman has confirmed there will be a dub released in Australia which in turn means that the US also can expect it!
Feel free to discuss your thoughts and hoped cast members here! I'll be watching this closely to keep you posted!