According to Dan Chung:
There are two options soon to be available. Both have a PL mount, are rehoused and fully geared but one is based on a Canon 70-200mm f2.8 mkI and the other a Nikon 80-200 f2.8 D lens. The Canon based lens is larger than the Nikon one but is also lower priced. The optical quality remains the same as the original lens so what matters is how much you need a manual iris and more accurate manual focus.
Watch the overview here: