Info:
Top new features added since 2016 include:
Drawing history: See changes made to your drawing over time.
Xref compare: Compare two versions of an external Xref and implement changes without leaving your current drawing.
Blocks palette: Insert blocks efficiently from the Libraries tab on desktop or in the AutoCAD web app.
Quick measure: Quickly display all nearby measurements including areas and perimeters in a drawing by hovering your mouse.
Trim and extend (enhanced): The default Quick mode now automatically selects all potential boundaries.
Purge (redesigned): Remove multiple unneeded objects with easy selection and object preview.
DWG? compare: Compare two versions of a drawing or Xref without leaving your current window.
PDF import: Import geometry (SHX font files, fills, raster images, and TrueType text) into a drawing from a PDF.
AutoCAD anytime, anywhere: Access AutoCAD from your desktop, web, and mobile devices.*
Shared views: Publish design views of your drawing in a web browser for viewing and commenting.*