27 discs??
My theory on what will be included:
UHDs of each 1-9 (obviously), regular BDs of 1-9, and the same bonus discs from before. That adds up to 27.
No it doesn’t. There were only three bonus discs in the 2011 Blu-ray set, and neither TFA nor TLJ has a bonus disc. The standard Blu-rays of both TFA and TLJ simply include all the special features on the same disc. In TLJ’s case the standard Blu-ray functions as a bonus disc to the UHD for that reason.
So if they just included what’s been released so far, plus ROS and new UHD discs for all the films aside from TLJ, that would only add up to 21 discs.
At the very least they would have to spread everything out to an extra disc per film to get 27 discs. Which would be incredibly inefficient. And I can’t imagine they have enough new features from the sequels alone to make up 6 discs. So we should expect at bare minimum they include a lot more special features for all the films in some shape or form. That may or may not include the OUT.