AutoCAD Features AutoCAD New Features Overview.
P&ID Line Groups
It is now easier to manage line groups and line numbers (line group tags). The new way groups are assigned also helps prevent accidental changes to the group when you edit line segment tags.
For more information, see About P&ID Line (SLINE) Grouping.
Plant SDK (Developer)
Developers can now create and connect equipment and sline components in P&ID drawings using new high-level APIs.
A new CreateSline sample project is provided to create the line shown above.
Download the Plant SDK from the Autodesk Developer Network here: http://www.autodesk.com/developautocad.