2015

AutoCAD 2015: Complete Guide to What’s New
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You can control object snap behavior for dimension extension lines with a new option on the Drafting tab of the Options dialog
box.
When you create continuous or baseline dimensions with the DIMCONTINUEMODE system variable set to 1, AutoCAD inherits
the layer in addition to the dimension style of the dimension that is being continued or used as a baseline.
You can press the Ctrl key while creating a polyline arc to draw it in the opposite direction.
Polyline enhancements
You can now fillet polyline arc segments.