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They didnt include it in the pymel api wrapper, but this would be it I think.
import pymel.core as pm
import maya.OpenMaya as OpenMaya
face = pm.MeshFace("pCube1.f[64]")
pt = face.__apimfn__().center(OpenMaya.MSpace.kWorld)
centerPoint = pm.datatypes.Point(pt)
-- justin