Unless something changed about it, this has been around for a few months. My team uses it. In practice, it's been fine. It's nice to be able to flag something as Ready for Dev, and link it to a Jira ticket in a way that presents the developer with a nice package and makes it easier for them to find stuff. They've got an extension for VSC that is kind of interesting because it integrates pretty tightly with Figma designs. I'm on the design side right now, so I haven't really used that part of it extensively. It certainly feels to me like they want to do more with Dev Mode than they already have.