Ubuntu 14.10, nicknamed Utopic Unicorn, is coming in just a few months. Alpha releases have been available for some time but beta testing started last week, meaning code is generally stable enough for virtual machines and other testing scenarios.
Ubuntu’s current release cycle means that the main Ubuntu line usually sits out the first beta and 14.10 is no exception. There is no beta 1 for Ubuntu 14.10; instead this beta consists of a number of participating “flavors,” whose betas are also now available.