Autodesk has posted the ObjectARX 2014 and AutoCAD 2014 .NET Training materials to AutoCAD developer page under Learning section.
Visit http://www.autodesk.com/developautocad for downloading the Training materials.
The following new or changed features are now exposed through the API:
- Connected Desktop - Design Feed
- Point Cloud
There are also quite a few other useful news for developers. For example for .NET these are some examples: MLeader.Scale Property that gets or sets the scale for the MLeader or RegionAreaProperties with properties to get area, centroid point, extents, moments of inertia, perimeter, principal moments, product of inertia and radii of gyration.
See also AutoCAD 2014 API for more.