For moving components in assemblies we have right now available the click-and-drag, the "Free Move", and the "Grip Snap" commands.
It will be very useful for people dealing with PCB (Printed Circuit Boards) packaging, machines layout, factory layouts, etc. to be able to move components in a predefined grid as doing the preliminary placements. This will work while being in "orthogonal mode" or in "face mode" (relative to a selected face).