Kotaku - Sources: Sony Is Working On A ‘PS4.5’

[Bryank75]

If they do launch a "4.5" console, they should call it something along the lines of PS4 Pro or Elite. It devalues the normal offering less and just provides it as a more high end version. Similar to how they do economy class or business class etc.

 

4.5 has an immediate connotation of 4 being outdated.