The small control at the end of every row is gone. Choosing a row is what shows that section now: its picture, what it does, and a link to open it all appear together in the margin, and the chosen row stays marked in the list. Because the picture and the words are one panel, they always describe the same row; before this they could be about two different ones. On a narrow screen, where there is no margin to print into, choosing a row opens the same panel underneath it.
Choose a row on the front page to see that section
Rows in the product list now open the section's picture and description themselves, instead of a separate control at the end of the row.