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Site Reviews was at v5.15.0 when that topic was posted. Since then, the Review Themes, Review Authors, and Review Notifications addons have been released, and Site Reviews is now at v6.11.8 (with 85 plugin updates).
The Reviews Comments addon is still planned, but not for right now.
The next releases will be Site Reviews v7.0, major updates for all existing addons, and a new Review Actions addon.