ParaView 4.0.1 is now available for download. This release marks the first change in the major version number since 2007. Unlike the change from 2 to 3, however, this release is not a major departure from the 3 series, but marks a milestone in the gradual progression of ParaView UI and framework since 2007. These notes highlight some of the major enhacements in this version that addresses over 130 issues since the most recent release. ParaView 4.0.1 is based on VTK 6.0 and hence includes all the fixes and enhancements that went into the VTK 6.0 release.