I personally cannot think of a new ruby gems or bundler feature from the past decade that I noticed or cared about. That isn't to say that there aren't any; I just don't know what they are.
Given the rise in supply chain attacks, I'd also like a private rubygem instance where I can whitelist gems and even versions for my company in a way that doesn't let anything else install. I'm not sure if they're taking that on or not, but I'd like it.
the rv thesis is here: https://andre.arko.net/2025/08/25/rv-a-new-kind-of-ruby-mana...
that was always possible https://guides.rubygems.org/run-your-own-gem-server/
(there's also "gem server")
Seems like you're the ideal consumer for this new service, since it actually has people who can do that.
I'm unsure on who is better placed to handle that stuff now. My view is that the people that were doing that are now with gem.coop, but rubygems still has the infra (i.e. you'd email security@rubygems.org still for now).
I'm unsure about what to think about longer term (my personal approach is currently "wait and see").
Similarly, I'm perfectly happy with bundler for now, but if `rv` turns out to be like `uv`, I'd happily switch (drop-in replacement, but faster/some better features).
[0] https://www.bleepingcomputer.com/news/security/60-malicious-...
[1] https://blog.rubygems.org/2025/08/08/malicious-gems-removal....