Timeframe - well, hope to release it before 15th October, but I’m hilariously poor with deadlines so take it with a metric ton of salt.
About updating existing project - it will be safe to install it on top of previous version, just note that to have new features in the blueprints there will be a need to grab them from the newest BuildKit, old blueprints in your buildings won’t be changed/updated automatically with the installation of this new version (updated blueprints will have “_v2” suffix in their names to avoid re-writing old ones).
But it will be wise to backup your project before update, just in case…