A series of expert-level blog articles guided by your experiences teaching a pre-2010 C++ guru would probably be well received by other such "ex-gurus." They would need to be definitive, detailed, verbose and bring the reader up to C++ lawyer in the relevant new feature to be interesting.

A trip through the graphics pipeline has the correct level of detail:

https://fgiesen.wordpress.com/2011/07/09/a-trip-through-the-...