* Document units: now you can set the default units for each document in the Document Preferences dialog. These units apply to the rulers and the statusbar coordinates (previously unchangeable) and are preselected in all unit menus (such as in the Selector controls bar). The units are saved with the document, so you can make yourself a default template with your preferred units.
* The px (pixels) unit is added to most unit menus. This is what is called "user unit" in the SVG specification, and in SVG code it is written either with the px suffix or (more often) without any suffix. Inkscape converts most dimensions to user units when writing them to SVG, and now you can use this unit via the GUI as well. Note however that the conversion ration from px to absolute length units may vary in different SVG renderers and different output media (e.g. Inkscape uses px/pt = 0.8 for screen editing), so you should not use px and absolute units in the same document. If you want one px to correspond to one bitmap pixel on export, use the export resolution of 90 dpi.
* In Selector, the statusbar now reports not only the number of selected objects but also the number of layers in which they are selected and, if there's only one, the name of the selection layer.