... 28th of April 2011!
And Maverick Meerkat (Ubuntu 10.10 [4]) should be released on October 10th, 2010.
According to Softpedia: http://news.softpedia.com/news/Ubuntu-11-04-a-k-a-Natty-Narwhal-152603.shtml [5]
So, get ready !
Links:
[1] http://pulse.veltsos.com/category/it/innovation
[2] http://pulse.veltsos.com/category/it/software/software/os/linux
[3] http://pulse.veltsos.com/category/it/open-source-foss
[4] http://news.softpedia.com/news/Ubuntu-10-10-Will-Support-Gestures-with-Multi-touch-152386.shtml
[5] http://news.softpedia.com/news/Ubuntu-11-04-a-k-a-Natty-Narwhal-152603.shtml