As part of the Command Preview feature added to AutoCAD® 2015, AutoCAD® Architecture 2015 includes an in-command, dynamic preview of the results of grip edits, moves, fillets, chamfers, extends and trims on Walls. For example, in the 2014 release, grip editing a Wall gives you a "ghost" of effect of the grip edit on the Wall, but nothing else.
Command Preview can be turned on or off by using the COMMANDPREVIEW System Variable (0 is off, 1 is on), or, in the Options dialog, on the Selection Tab, in the Preview area in the lower right, by checking (on) or unchecking (off) the Command preview toggle.
If you want to leave Command Preview on, but not have anchored objects as part of the preview, you can use the AECENABLEASSOCANCHOR System Variable to turn this effect ON or OFF. Both AECENABLEASSOCANCHOR and COMMANDPREVIEW are saved to the registry, so a changed setting will affect all drawings.
As previously noted, the Command Preview also works with Walls and the MOVE command,
In addition to object anchors, the preview of anchored objects also applies to leader anchors, node anchors, cell anchors and volume anchors. In AutoCAD® MEP 2015, Command Preview applies to plumbing and schematic lines. Command Preview also applies to AutoCAD objects to which the commands noted above apply.