The repositories are not yet ready but these are the platforms that will be supported at launch:
xUbuntu_12.10 (i586, x86_64)
xUbuntu_12.04 (i586, x86_64)
openSUSE_12.3 (i586, x86_64)
openSUSE_12.2 (i586, x86_64)
openSUSE_12.1 (i586, x86_64)
Fedora_18 (i586, x86_64)
Fedora_17 (i586, x86_64)
Записываться в тестеры здесь.