Diablo 3 has been scaled down to a skeleton crew working on themed seasons, and themed seasons seem to just re-use old assets.
Diablo 3 is in maintenance mode, there is no money to be made from it. Hade Necro sold well then sure, but it most likely didnt sell well enough. As soon after Diablo 3 went into maintenance mode with most of the talent being shifted to other projects.
Stop expecting things for Diablo 3.