So I just bought a Topas 53 from the Rimowa San Francisco store and I asked about the redesign. The change is has to do with the grooves stopping before the corner reinforcements. Basically, the corner reinforcements are going to be on a flat surface rather than the grooves just like on the polycarbonate ones (i.e. limbo). That's what I was told by the manager. No official timeframe yet but they said probably around the end of the year.