991 refresh

[RankAmateur]

So the 991 is due a refresh/facelift later this year, and there's already been plenty in the press about the 991.2 going all turbo across the range. My question is: does anyone know whether Porsche will roll out the update gradually across the range (eg Carrera 2/4 this year, then Turbo next year, etc), or will everything from base Carrera to Turbo S get refreshed at the same time?