Can confirm Periwinkle is a thing. It started a couple of years ago.
However, as far as I know, it's also done. The scope was massively reduced once they realised the complexity of what they are trying to do (which isn't sunsetting Heroku, but more moving it in the direction that Salesforce Functions has taken). In the end, Periwinkle essentially transpired to be the banner that you now see at the top of Heroku properties.
Saying that, I've been out a few months. I don't know what the current plans might be, and I do wonder if recent events might have SFDC evaluating what's next.
The codebase is sound. I would almost certainly expect that the reason for the slowness is the ability/diligence and paranoia levels the SFDC security teams have. They won't want to turn this back on until they are absolutely certain it's 100% again.
Can confirm Periwinkle is a thing. It started a couple of years ago.
However, as far as I know, it's also done. The scope was massively reduced once they realised the complexity of what they are trying to do (which isn't sunsetting Heroku, but more moving it in the direction that Salesforce Functions has taken). In the end, Periwinkle essentially transpired to be the banner that you now see at the top of Heroku properties.
Saying that, I've been out a few months. I don't know what the current plans might be, and I do wonder if recent events might have SFDC evaluating what's next.