I am absolutely 100% certain of this: 'Force & Destiny' _won't_ stress 'midichlorians'. No way, no how. FFG won't want to stir up this most controversial element in that way.
All we will get is some sidebar saying: 'Some people believe that the Force can be measured by tiny organisms in the blood called 'midichlorians'. If you want a more 'hard sci-fi' feel to your game, you can use this explanation. If you want to keep a more 'science fantasy' feel to the game, it's fine to simply describe the Force as 'the spiritual energy that surrounds and binds all living things'.
Bear in mind many things Lucas did were merely an 'ass pull'. That is, for a plot point, he pulled some random stuff out of his ass to illustrate a point, and then never mentioned it again. These were never intended to really be 'canon' or part of 'world building'. Midichlorians are never mentioned again in the films after they are used to describe why the wretched brat is such an uber Mary Sue. Hutts and Toydarians are given blanket Force-immunity because the films would be drastically shortened if Luke or Qui-Gon were to use a Charm power on the NPCs at that point. So like any bad GM, Lucas just invents a new species that is Force-immune.
Interesting that EtU describes this as fluff for Toydarians, but isn't part of the racial powers as it is for Droids. And equally telling that Hutts lost it between the Beta book and the real thing. I think all it means now is that these species have a higher willpower.
So I'm _damned_ if I'm going to let Lucas' random brain-farts become an important aspect of my games.
So for us, 'midichlorians' exist, but don't measure anything that scientists can be certain of, an inexact science that is mostly dismissed as quackery. Hutts and Toydarians have no Force immunity beyond a higher Willpower score.
Edited by Maelora, 26 December 2013 - 09:21 AM.