Things don't really change in C++, they only add to it, right?
That depends. Old ways of coding still work fine but are considered harmful, e.g. use of NULL instead of nullptr, using raw instead of smart pointers, not making use of C++11 features.
There is also something like std::auto_ptr which has been deprecated since C++11 and currently looks to leave us completely with C++17. Granted, it's the only thing I can think of right now which could be actively removed.