How do I upgrade to Ubuntu 13.04 (testing)?

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http://askubuntu.com – Ubuntu 13.04 has been announced and development has already been started. I have installed Ubuntu 12.10 in Virtualbox (with precise as host OS). Now I want to upgrade 12.10 to Ubuntu 13.04 testing so that I get all the bleeding edge software and latest development updates. How do I do that? I heard somewhere that its by adding 13.04 repos and removing 12.10 ones. All help will be appreciated. (HowTos)