Yes, this is unexpected. Companies of this size like to announce big news well in advance. A change in leadership that is effective immediately seems to imply that something sudden happened. That could include Iger being presented with a better opportunity (maybe a pending VP nomination), a sudden change in life priorities (maybe health scare for him or a family member), or an attempt to get out in front of a scandal.

Really unexpected for a company as well run as Disney. A few things:

  -Disney+ - Seems to be doing incredibly well.
  -China market - Both parks and movies will be extremely hard hit near turn, also with Mulan coming out soon will prb be really bad numbers(surprised they did not move release date).
  -Domestic parks and European parks may take a hit as fares increases(US only?) and virus worries keep people away. 
  -2020 films are not the heavy hitters that 2019 was, expect less revenue here and still less due to virus issues.

So despite disney+ doing well a few dark clouds on the horizon, I'm really hoping its not something health related.

In the article it states he was only 14 months into a 36 month contract extension, so it was unexpected based on the timing of his contract.

It’s a little goofy.

It's an extremely goofy move.