There are no official announcements, release dates, or plans for a 1.23 update on Minecraft Xbox 360 Edition.
The final update added the Ender Dragon, End Cities, Elytra, Shulker Boxes, and a handful of blocks—roughly equivalent to Java 1.9/1.10.
Your Xbox 360 world saves cannot transfer to Bedrock. If you want the latest features, you need a modern platform.