Hey there @creciendo 
Many modules and systems have now caught up. There is a new server-side migration structure in v12 which increases world startup reliability but may increase world startup times for worlds or systems with many compendiums and we’re in contact with Foundry regarding this.
v12 brings many great new features and if you’re interested in using it for your game (and have made backups of your worlds and compendiums) I’d encourage you to test it out! We’re currently evaluating whether we’re ready to move it to the recommended track on Forge and hope to have more information soon.