I have finally uploaded core 2.5. As I've said previously, there's nothing really fancy for the players to see in core 2.5 yet. However, even though you cannot see it, the core of TNR has been updated, now being more clean and efficient.
Besides core updates, the news, registration and profile pages have also been updated to use the new core 2.5 functionality. The rest of the pages are still the "core 2" pages, so to speak. Over the next many weeks, all pages on TNR will be updated to core 2.5 one by one, starting with the more "popular" pages like the tavern etc.