The familiar width and break controls on options panels have been relabeled, and a new pair of controls has been added. The existing width and break controls are now labeled "Tile," and the new controls are labeled "Content."
The "Tile" width determines, as ever, how wide a module is relative to the column it's in. The new width option, in turn, determines how wide the content of the module is relative to the total width of the module (as determined by the "Tile" width setting). If the content width is set to less than "Full," you can align the content within the module: on the left, in the center, or to the right.
In the screenshots below, you can see the new options panel for a section, as well as an example of what the settings in the sample options panel would produce on the front end if applied to a section in the left column. In the example, the tile and content areas have been highlighted and labeled.