As you may already know, Canonical has been working a lot lately at Ubuntu Desktop, Ubuntu Touch, Mir, Unity and convergence.
Recently, Canonical’s Pat McGowan has announced that the first Ubuntu-convergent mobile phone will be released in 2016, the vendor being still unknown from now.
The convergent Ubuntu system will be using the same code base for both Ubuntu Touch and Ubuntu Desktop but the UI will behave different on the two platforms. While the windows will be full screen on the mobile devices, on Ubuntu Desktop, the windows will still be minimizable and will have X and – buttons on the top corner.
For more information on this, see this keynote, or read the transcript created by (un)friendly dragon.