this fall, but since manufacturers won't need to worry about carriers, there is a fair chance that we'll see commercially available Ubuntu tablets before then. Canonical put out a press release today saying that 14.04 (codenamed Trusty Tahr) will "form the basis of the first commercially available Ubuntu tablets from Canonical's OEM partners", but there was no word on exactly who those partners might be.Canonical founder Mark Shuttleworth said in March that the first Ubuntu phones will likely come out
Developers can build apps that will run on any form factor, but in Canonical's vision, "convergence" means the same OS code running on all devices as well. But, Canonical has not yet been able to finish the full convergence of the Ubuntu code, so there will still be separate downloads for desktops and mobile devices.
source: Ubuntu Insights