PrestaShop 1.4 enabled you to indicate the product manufacturer right on this page. In Since version 1.5, this setting is to be found in the "Associations" tab on the left. Same for the "Default category" field, the associated categories, and the "Accessories" field.
Version 1.4 also enabled you to indicate the size and weight of the final package. In Since version 1.5, these settings are to be found in the "Shipping" tab on the left.
The "Location" field of version 1.4 can be found in the optional "Warehouses" tab on the left, which is only available if you have enabled Advanced Stock Management ("Preferences" menu, "Products" page, "Products stock" section).
Combination quantities are managed from the "Quantities" tab on the left, which is a new feature of that was introduced with PrestaShop 1.5.
When creating a virtual product (see further below), you can now upload a different file for each combination. In PrestaShop 1.4, you had to pack all combinations into a single Zip file, and have the customers download all combinations.
In PrestaShop 1.4, there used to be a "Color picker" form at the bottom of the list of combinations, where you could choose to display a color picker or not on the product page.
In Since PrestaShop 1.5, this option has been moved and improved. When creating a new attribute (in the "Catalog" menu, "Attributes & Values" page), you can use the "Attribute type" drop-down list to choose whether the front-page should display it as a drop-down list, a radio button list, or a color picker.