Finally, it seems Canonical has decided to develop a new set of icons for better and excellent integration into Unity.
During the Ubuntu Developer Summit session yesterday, we have noted that the new icons will be introduced into both desktop and mobile (Touch) versions of Ubuntu.
NOTE: That this are drafts and prone to changes in the official release of Ubuntu 14.04 in April 2014.
Below are images of the icons.
You can watch video Google+ hangout vUDS on Youtube : LINK