http://www.smogon.com/forums/threads/smogon-usage-based-tier-update-january-2015.3525882/

Wobbuffet moved from NU to PU
Lopunny moved from RU to OU
Altaria moved from UU to OU
Gallade moved from RU to OU
Mantine moved from PU to NU
Glalie moved from PU to NU
Garbodor moved from BL4 to NU
Slurpuff moved from BL3 to RU
Camerupt moved from PU to NU
Quagsire moved from UU to RU
Mawile moved from UU to RU
Medicham moved from OU to UU*
Sharpedo moved from RU to UU
Pangoro moved from BL3 to RU

*Medichamite is back to BL for now--the UU suspect council can decide whether to let it back into the tier.