Jolla have been in contact with representatives from Sony from the very beginning. It's possible that Sony lawyers got caught wind and didn't like what they saw or its more likely that a third-party has forced Sony's hand.

It's going to be around the distribution of the required binary blobs, and these are licenced to Sony by third-parties. It seems that the flashing image will need to be 'packed' by the sony flashtool for arguably some non-technical reason.

I would guess either Sony changed something in this EULA or Jolla missed something from it.