Shuttleworth said earlier in February that devices running Ubuntu Touch will actually ship in October, but that seems unlikely now given that we have had no announcements of that sort to date... More realistically, a first-time consumer-ready version (lets say Ubuntu Touch v1.0) should be ready in October 2013 (and released along with Ubuntu 13.10 desktop version).
The header fields are transmitted after the request or response line, which is the first line of a message.
Header fields are colon-separated name-value pairs in clear-text string format, terminated by a carriage return (CR) and line feed (LF) character sequence.
The end of the header section is indicated by an empty field, resulting in the transmission of two consecutive CR-LF pairs.
More robust versions of Ubuntu for Tablets will likely be available for the Nexus 7 and Nexus 10 tablets by the end of the year.
However, Ubuntu tablets won't ship until the UI layer is folded into the fully unified Ubuntu 14.04 in the spring of 2014.