As the other post says the two aren’t linked.
There will be an update splash
That’s not entirely true. In the past, particularly when Maps was “new”, it was released only to those on the beta to limit exposure in case things didn’t work.
That only changed in the USA to being pre-released to a select portion of users before a general release AFTER it was proven that the releases were working without major issues.
While in general one could say Apple has done this before, we are now talking about whole new countries with different driving rules, signage, etc. It makes sense that Apple will release new Maps to those on the beta only as they did with Northern California so they can get a couple of months of feedback/usage before a release to the general public in the Fall.