  A new description of free massless superfields of arbitrary superspin $Y$
($Y>1/2$) is proposed. Following the first-order philosophy, we relax some of
the properties (reality, gauge redundancy) of the unconstrained higher spin
prepotentials and we construct first and half order invariants quantities.
These are used to write trivially invariant actions. Additional auxiliary
superfields that play the role of spin connections are used to enforce a new
local symmetry that restores the degrees of freedom.
