ZSpheres 2 and ZSketch Surface noise Brush noise Improved LazyMouse with Backtrack and Snap to Track modes New brushes such as Trim, Planar, Noise, Move, Spherical, Slide, Form, Flakes, Crumple and more New Brush Depth Masking to give complete brush control on a surface New MatCap materials for ZSpheres 2/ZSketch mode Gradient PolyPaint Each Subtool can now have it's own Texture, Displacement, and Normal Map Enhanced displacement and normal map options such as native export of 32-bit displacement maps, High-Definition Displacement, Normal, and Texture maps from HD geometry Improved perspective with a floor grid Reorganization of the Tool sub-palettes to coordinate with selected SubTools Ability to merge all visible SubTools and optionally weld the seams New PUVTiles mapping method, which represents the most efficient use of UV space yet PolyPainting accuracy has increased from 8 to 16 bit Mesh masking has increased from 8 to 16 bit New Gradient polypainting option to give a dynamic transition between colors New navigation to work with the virtually unlimited zooming Right-Click Navigation New sliders added to Project All, providing more control over your results Memory management enhancements give the capability to subdivide your models to higher polygon counts New ambient occlusion masking, which can create an AO texture for use in other applications Improved export/import options with the capability to import and export Maya .ma file format with automatic setup of shading network for Texture, Displacement and Normal mapping (This feature is a part of the GoZ system. The full GoZ implementation will be included in the next update ) Fast local access to ZBrush files with the new LightBox browser (the full version of LightBox will be included in ZBrush 4) ...and many more enhancements and optimizations throughout ZBrush.

Be sure to visit the ZClassroom to view the new ZSpheres 2, Surface Noise, Planer and Trim Brushes videos!

Questions and Troubleshooting for ZBrush 3.5 should be posted in the Q&T forum

ZBrush 3.5 Windows is a free upgrade to all registered users.
ZBrush 3.5 for Mac OS is in development, release date will be posted when available.