In this talk I will briefly review the present status and motivations for an accurate measurement of the top quak mass. In particular I will outline future strategies and possible outcomes for a global combination of top quark masses measurement at hadron colliders. I will discuss the role that new types of measurement can play to clarify the issues of present precision top quark measurements. In this context, I will present a distinctly new strategy for the top quark mass measurement based on properties of energy spectra, which can be applied both to b-jets and (under several guises) to B-hadrons observables, resulting in a sub-percent top quark mass determination.