The map composer (used to prepare printable map compositions) has received a number of improvements in QGIS 2.6.
You can now change the secondary fill color for scalebars
Holding shift while drawing line/arrow items constrains drawing to horizontal, vertical or 45 degree angles
Holding shift while drawing other new items constrains them to squares, holding alt causes item to be drawn from the center
Right click no longer locks/unlocks items, this is now handled by the new items panel. Locked items can no longer be selected from the composer canvas, allowing for interaction with items below them.
Holding alt while pressing cursor keys results in a 1px movement for items
Removed the destructive 'Load from template' menu item, replace with a new non-destructive 'Add items from template' action
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