Ironically, the point of the periscope lens is that it - in a way - changes the physics of lens design to make it smaller.Good enough — because of the camera bump. You can't change physics. Light travels in a path. Remove that path and you lose depth of imagery.
I'm not saying I want the camera bump gone though. On the contrary, I just want a replacement for that 3X lens. It ain't great to begin with, and it'd be nice to have it replaced with a 6X periscope lens.