We do also support still JDK7, and most of our stream users won't be impacted that much beyond the configurations changes (Environment vs SchedulerGroup). Better, you can already see the result of a focused work on API surface in the deployed javadoc
next.projectreactor.io/stream/docs/api/, and a few examples on the individual repo.
It's just we have taking a new dimension and needed a careful organization as it is the story #1 for our next iteration of Spring and a chance for a stable long plan :)