On a blog post by mark shuttleworth in his blog in this post he pointed at the new ubuntu 13.04 codename possibly will be Raring Ringtail.
So bring along a Nexus 7 if you’re coming to Copenhagen, because it makes a rumpty reference for our rootin’ tootin’ radionic razoring. The raving Rick and his merry (wo)men will lead us to a much leaner, sharper, more mobile world. We’ll make something… wonderful, and call it the Raring Ringtail. See you there soon
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ubuntu 13.04 Raring Ringtail
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in blog post mark shuttleworth also pointed that next LTS release will be 14.04 and it will be coming with ubuntu phone and ubuntu tv line-up