Having updated to 'OS27, everyone with access to the new Siri features will see the Siri-beta logo - just like this:

Why Siri Beta? Apple's new Siri, while now released, is still being actively developed. With this first release, just as Apple Intelligence was similarly marked when released last year, it has a beta logo - perhaps to highlight the fact that it is still under active development and may still produce unexpected results. As you see this logo when accessing Siri from iPad settings, this feature is already active on your iPad without needing to be wait-listed in your locale.
Additional information can be found here:
How to get Siri AI - Apple Support