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It seems to be a private project that might one day be public, a bit of a non-starter if you can't get access to it.

Do you know the dev, or is there a waitlist somewhere where I could possibly get access to try it out? I couldn't locate one on their site.

The closest thing is a Discord server linked in this post: https://mitchellh.com/writing/ghostty-devlog-003

Beta invites are nearly random, though.

Is there anything "life changing" about it, or more like "out of my way" quality?

It's more the latter: Ghostty doesn't introduce any groundbreaking features, instead it's a bunch of incremental improvements/nice-to-have's.