According to The Anime Network's Tweet, Sentai Filmworks
has licensed A-Channel
No release details have been announced at this time.
Update, Nov. 8th
, UN-GO is to be available digitally soon and released on DVD and Blu-ray next year.
Update, Nov. 9th
, A-Channel will be available digitally and on subtitled DVD next February.
Source: Anime Network's Tweet
, UN-GO Press Release
, A-Channel Press Release