Next.js 15 introduces several new features including an automated code migration tool, a fast Turbo Pack development server, and a new API for running code in the background. The most significant change is an overhaul of the caching system, making it more intuitive and allowing developers to control caching behavior on a per-function basis. The new 'Dynamic IO' API simplifies code and makes caching explicit. Users can define caching strategies, manage cache expiration, and invalidate cache on-demand, enhancing performance and practicality for complex applications.
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