After I installed Camera Raw 9.1 a couple months ago, I noticed that the Zoom Tool range has been increased to 1600%. I am using CS6 Master Collection and I thought that the only changes for CS6 were going to be new camera support. With my curiosity aroused, I searched through new features added for the CC version of ACR 9.1 and several things including photo merging and HDR are described, but not a word about zoom. I thought maximum zoom was going to be 400% forever. Did I miss something somewhere? Not complaining, but just surprised by this Easter egg.
Many of the new features are turned off for CS6, but something like the zoom, might have just been an adjustment that was let pass for both PS versions.