I am very happy to see this. Phabricator is an incredibly well written and deeply thought-out tool (even if people may disagree with some of its philosophies regarding e.g. patches and code review) and it had a tremendous influence on my career and the way I thought about managing and contributing to software projects. I say that as someone with a few patches in Phabricator itself.
I hope Phorge is just as successful and retains that levity and unique polish that Phab had; looks like a lot of the old guard contributors are around as part of this, so I'm very hopeful. Maybe I should spin up some of my old patches for things like WebAuthn support and re-submit them...