It's available for pre-order from Rightstuf Anime for $32.48 (or £26.56)
I pre-ordered it from there. Also on Amazon, but for $49.95.
All it includes is the English dub according to the specs. A bit disappointing, yet not surprising. There's problems that come with syncing it to the English dub (and vice versa) due to the frame-rate and edits. Still hope the quality is an improvement compared to the UK DVD.
Given this is Discotek Media, there's a possibility that they might release the Japanese version separately, which is what they did for "Samurai Pizza Cats" and "Monster Rancher".