Hi Plastikschnitzer,
thanks for the questions.
oCIS stable status: This will happen later this year, probably during summer. We can not give a concrete day today because we want to make sure to release it with a high quality. As we are only at the beginning of the beta phase it is too early for concrete estimation.
How will ownCloud10 continue: That is answered in the FAQs here: Infinite Scale - the new cloud-native data platform (scroll down)
The bottomline is: Infinite Scale is a new product. It does not have an direct impact on the future of ownCloud10, which fulfills a different use case.
PHP8: Currently there are no plans to start working on PHP8 support. Even after the end of support upstream of PHP, there will be maintained versions of PHP 7.4 around from various distros. That should give plenty of time.
Please see Php version not compatible - #7 by jnweiger for more information.
best regards,
Klaas