First of all: The Update went smoothly and F-Droid is running now with privileged extension out of the box. Thanks to the developers 
@7adietri: You can watch the actual state of patching spectre vulnerability in FP2 patch for Meltdown/Spectre
For cooling down in the meantime this proper post of @Roboe is bringing some things in its true light: Fairphone Open 18.01.1 is now available