Version tags should be used only for questions that apply to a version only, not to merely say what version a site is using.
Drupal 8 introduces major changes, such as:
- Support for HTML 5
- Improved support for web services
- Improved multilingual support
- Mobile devices
- Configuration API
- The Views module in core
- Twig as templating engine instead of PHPTemplate
For a description about the current Drupal 8 initiatives, see the Drupal 8 initiatives group.
Use this tag only if your question relates specifically to this version.
Each major release of Drupal is not compatible with the previous one; hence the importance of using, wherever appropriate, a version tag.
The other release specific version tags available today for the most commonly used releases are: