Yes, Gundam Unicorn does have English dub as well as various subtitle tracks.
Basically, if you want to know whether a certain anime has a dub or sub in its Japanese edition, you should probably check out what its page on
CDJapan says. It does list various info, which includes dub and subtitle tracks, so it's a good way to see beforehand if you can just get the Japanese edition or you'll have to wait for the English one.