The new feature this time is more of a bug fix - Panorama Merge now respects any spot corrections you've done to the source photos before merging.
Until now, it would have ignored them, meaning the dust spots would reappear each time that area occurred in the final merged picture. Now, you can use AutoSync to correct each spot once before running the merge, and your corrections will be baked into the stitch. This can be a huge timesaver for those (like me) with dusty sensors. I've scribbled some notes about it
here.
