I will really miss Pivotal. Looks like my org will shift to Jira. People talk a lot about how Jira is so customizable to the point of it being problematic. But would it be possible to customize it to work somewhat like Pivotal, I wonder?
Like others have mentioned, if you like Pivotal, check out Linear first.
If you end up on Jira, once you get it configured, put the admin password in a bottle and throw it into the ocean. Do not let anyone say "you know, if we made this one little change to our workflow...", because once that dam breaks all hope is lost.