  An upgrade of the present IceCube surface array (IceTop) with scintillation
detectors and possibly radio antennas is foreseen. The enhanced array will
calibrate the impact of snow accumulation on the reconstruction of cosmic-ray
showers detected by IceTop as well as improve the veto capabilities of the
surface array. In addition, such a hybrid surface array of radio antennas,
scintillators and Cherenkov tanks will enable a number of complementary science
targets for IceCube such as enhanced accuracy to mass composition of cosmic
rays, search for PeV photons from the Galactic Center, or more thorough tests
of the hadronic interaction models. Two prototype stations with 7 scintillation
detectors each have been already deployed at the South Pole in January 2018.
These R&D studies provide a window of opportunity to integrate radio antennas
with minimal effort.
