Photoshop's tool panels now collapse and fly out; the interface can take up as much or as little of the screen as you want. It didn't take me long at all to get used to this hide-and-seek style of user interface.
Though nothing has changed in Photoshop's printing capabilities--a real disappointment in light of Lightroom's advanced page layout controls--Adobe has at least consolidated all the print options into a single dialog box.
Though Adobe is touting its "enhanced" Curves interface, I don't think it will have a big impact on any particular user. The concept and implementation is still a bit too opaque for newbies, though perhaps a few experienced prepress users may benefit from the addition of ink adjustment curves.
These two photos are combined (1) into a single (2) with Photoshop's PhotoMerge auto align and blend capabilities. The software masks out the unwanted portions (3) so that you don't lose any of the original. You can also manually align and stitch photos.
This version of Photoshop can import and extract metadata from DICOM files. It ships with a related scripts which opens a set of the images as individual files in Photoshop.
As part of its new Analysis tools, Photoshop can drop counters with automatic numbering and measure the distance and angle between two points. You can record the data on a point-by-point basis, then export the whole to a file.