The release note for Herwig 7.0 / Herwig++ 3.0 introduces significant improvements and new features in the Monte Carlo event generator. This version marks the end of distinguishing between Herwig++ and HERWIG development, consolidating the physics capabilities of both into a single event generator. Key enhancements include: 1. **NLO Event Simulation**: Built-in NLO hard process calculation for all Standard Model processes, with matching to both angular-ordered and dipole shower modules via subtractive (MC@NLO-type) and multiplicative (Powheg-type) algorithms. 2. **QED Radiation and Spin Correlations**: Inclusion of QED radiation in the angular-ordered shower and consistent treatment of spin correlations. 3. **Perturbative and Shower Uncertainties**: Automated assessment of perturbative uncertainties in hard processes and parton showering. 4. **Angular-ordered Parton Shower**: Significant improvements to the angular-ordered parton shower, including better agreement with data. 5. **Electroweak Corrections**: Implementation of electroweak corrections to heavy vector boson pair production. 6. **New Documentation**: A completely rewritten and extended online documentation system. 7. **Tuning**: A new tune based on $e^+e^-$ data, improving the description of underlying event and double parton scattering data. 8. **Run Modes and Integration**: Introduction of new run modes and simplified input files for easier steering of the event generator. The release also includes several plugins and support for multi-jet merging and electroweak corrections, with detailed technical and physics aspects covered in accompanying publications.The release note for Herwig 7.0 / Herwig++ 3.0 introduces significant improvements and new features in the Monte Carlo event generator. This version marks the end of distinguishing between Herwig++ and HERWIG development, consolidating the physics capabilities of both into a single event generator. Key enhancements include: 1. **NLO Event Simulation**: Built-in NLO hard process calculation for all Standard Model processes, with matching to both angular-ordered and dipole shower modules via subtractive (MC@NLO-type) and multiplicative (Powheg-type) algorithms. 2. **QED Radiation and Spin Correlations**: Inclusion of QED radiation in the angular-ordered shower and consistent treatment of spin correlations. 3. **Perturbative and Shower Uncertainties**: Automated assessment of perturbative uncertainties in hard processes and parton showering. 4. **Angular-ordered Parton Shower**: Significant improvements to the angular-ordered parton shower, including better agreement with data. 5. **Electroweak Corrections**: Implementation of electroweak corrections to heavy vector boson pair production. 6. **New Documentation**: A completely rewritten and extended online documentation system. 7. **Tuning**: A new tune based on $e^+e^-$ data, improving the description of underlying event and double parton scattering data. 8. **Run Modes and Integration**: Introduction of new run modes and simplified input files for easier steering of the event generator. The release also includes several plugins and support for multi-jet merging and electroweak corrections, with detailed technical and physics aspects covered in accompanying publications.