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Gutenberg 15.3 was released this week with a new “Time to Read” block that calculates the estimated reading time for the post or page using the same method that appears in the details panel. The block displays this information on the frontend wherever it is inserted.
This is the first iteration of the Time to Read block, so it isn’t very customizable yet. Although users can add custom CSS to the block, it only includes alignment controls right now. The block needs Typography controls and more options for customizing its appearance to be consistent with other core blocks.
In 15.3 Duotone filters have been reworked in several ways to make them more portable across themes. Previously, duotone settings were stored as an array of colors. This has been changed so that duotone presets are stored as slugs, making the color swatches available when a user changes themes.