Ubuntu 23.04 (a.k.a. Lunar Lobster) is now released. As of today (April 20th, 2023), posts about it are no longer off-topic on Ask Ubuntu. As usual, posts still must meet the normal requirements for being on-topic, though.
Additionally, please refrain from re-opening questions about Ubuntu 23.04 that were posted prior to its release without Meta consensus. They can be re-opened, but it needs to be agreed upon via a Meta discussion first.
See also the Lunar Lobster Release Notes