Theme Preview is a free WordPress plugin that allows users to view how a new theme will look on their site without the need to activate it. This feature is particularly useful for those who want to experiment with different designs without affecting the live site. Users can seamlessly switch between themes and get a real-time visual representation, helping them make informed decisions before finalizing their choice.

Future enhancements for Theme Preview include the potential for an options screen, the ability to select themes from a list of installed options, and persistent previews through cookies. There are also plans to restrict preview capabilities based on user roles or capabilities, although it's important to note that the plugin may not function properly with child themes due to inheritance issues.