Me too. Nothing is working right in 1.12. If you use compose now, it schedules all the jobs on a single host. Swarm multi-host networking is not even working properly per my post here which has no response:
I am surprised that they are launching a massive PR campaign on a release that does not work right and is barely documented =( . I need a working orchestration system up and running for my site and love classic swarm. I eventually had to move to the Apcera Platform. Check out my journey: https://www.linux-toys.com/?p=582