Status Report: No penetration nerf happening, Mauschen not coming
here's a surprising turn of events from one of Wargaming's RU staffmembers (the thread where it was got deleted but the North Google cache remembers). Since there is no debunking from Storm available (he usually posts very quickly if such info is false), we have to assume it's the truth.
There will be no penetration nerf AT ALL, since the tests have shown that it didn't work. So no changes planned for now (at least summer and autumn will be without changes).
Also, Mauschen will not be implemented (it will not be in 9.9 test 2 anymore) because it sucks, devs decided not to put it in.