This is obviously just rolling out on the newly produced dolls, because almost all of the display dolls at American Girl Place in Columbus (as of May 9, 2018) had the old eyes. Except, that is, for the brand new dolls like Luciana, and the four Truly Me boy dolls. Here are some pictures to compare the eyes.
Point #1: The whites of the eye on the new eyes are bright white. Notice Luciana's eyes in the photo above and how white they look. Then, look at Gabriella's eyes in the photo, and you can see that they are a more realistic and muted shade. This problem is very noticeable on all the dolls, but more particularly on the darker skin tones. The eyes look like they are almost glowing and shining out from the face.
Point #2: The new eyes appear to be sitting slightly farther back in the head, which means that you can see in the sides of the eye. On further examination, though, we're wondering if it is not necessarily that the eyes are sitting farther back, but more that the new eyes don't fit in the eye sockets as well as the old ones. This is slightly visible in the photo of Luciana below (though it's hard to see in a photo).
Point #4: When you lay the doll's back to close their eyes, you see how thin the eyelashes are. And the eyes do not close down all the way. You still see white showing below the eyelashes.
The Truly Me boy dolls all feature the new eyes and have this problem. The eyes fit better in #77 (the modified Addy mold), and he tended to look good almost all the time. #76 (modified Sonali mold) has a real problem, and we had trouble finding any that did not look a bit strange.
So, if you buy a doll, be sure to check the eyes. The easiest test is to lay it down and see if the eyes close all the way and the lashes are wider than the iris.
This picture below shows another comparison of Nanea and Kaya. You can see Nanea's new eyes, but they don't have bad lashes, which makes a difference. The thinner lashes look very strange.