Indeed, it does depend on the definition. From a purely semantic point of view, I can see a split between short and long, or between short, medium and long, less so between medium and long since 'medium' means 'in the middle of', 'in-between two things'.
The English Wikipedia makes only the distinction between medium telephoto lenses and super telephoto lenses; the German Wikipedia, between "Porträtobjektive" (portrait lenses; between 85mm and 105/135mm), "Standardteleobjektive" (standard telephoto lenses; between 135mm and 200mm) and "Superteleobjektive" (super telephoto lenses; beyond 200mm).
This website uses "Short Telephoto Lenses (85mm - 135mm)", "Medium Telephoto Lenses (135mm - 300mm)" and "Super Telephoto Lenses (300mm+)" as subtypes. So does our beloved Bojidar Dimitrov:
Pentax Short Telephoto Prime Lenses (70-100mm),
Pentax Telephoto Prime Lenses (105-200mm) and
Pentax Extreme Telephoto Prime Lenses (300-2,000mm).
In addition, we are trying to decipher the meaning of an English expression used as the translation by Japanese people of a Japanese concept, so we better be cautious in drawing conclusions...
Last, if an 85mm would probably be more popular than a 135mm, the latter would better fill the existing gap between 77mm (FA Limited) and 200mm (FF-compatible DA★).
Anyway, we shall know in 2018.
Or later...