While
Fedora 18 isn't even seeing the light of day until 2013 under the codename of
Spherical Cow, the codename for its successor has already been determined.
Following a period of voting by Fedora contributors, the
Fedora 19 codename was determined based upon popular vote. The
list of possible codenames was again unique, similar to Fedora 17 being codenamed the
Beefy Miracle.
In the end, the Fedora 19 codename receiving the most popular votes was
Schrödinger's Cat thereby making it the next codename to succeed the Spherical Cow. Schrödinger's Cat secured 1876 votes while Higgs Boson was in second with 1620 votes and Tiddalik was in third with 1012 votes. Other top contenders included Loch Ness Monster, Newtonian Dynamics, Martian Blueberries, and Parabolic Potassium.
Confirmation of the Fedora 19 codename can be found in
this mailing list post.