Abstract
The LHC programme is yielding excellent physics, but thought is also being
given to future collider options. In CERN and in Beijing there are dreams of
a ring some 100km in circumference which could hold a super-LHC, with
energy of perhaps 100 TeV. There is also the possibility of hosting an
electron-positron collider in the same tunnel, with energy ranging from the
Z peak up to 240 or 365 GeV, ZH or ttbar production regions. The physics
goals of these large circular machines are discussed, with an emphasis on
the CepC, which had updates in a workshop last week.