Princess Leia with R2D2 aka Kenny Baker, who also died this year.

The great 2016 celebrity die-off somewhat explained

tl;dr version: Yes, more notable people have died in 2016. Why? Mainly because we have a lot more notable people than we used to, mainly because of the concurrence of the baby boom and the explosion of mass media, and we're now reaching a sort of critical mass of famous people of dying age (including a lot more people like Carrie Fisher whose excessive boomer youths may have accelerated the process). Yes, it will continue and probably get worse. It's easier than ever to become famous.