Yes you areright. If you are upgrading then the new priority names will not be available. But you can always go and edit the priority names.
Here's the link which confirms this
JIRA 6.4 ships with a new set of priorities, and a new resolution. The old default priorities of Blocker, Critical, Major, Minor and Trivial will be replaced with Highest, High, Medium, Low and Lowest. If you are upgrading an installation of JIRA, or importing existing data, JIRA will respect your original priorities and they will continue to be available instead of the new priorities. The new priorities will only become available and therefore the default in new installations.
Badges are a great way to show off community activity, whether you’re a newbie or a Champion.Learn more
Hi Atlassian Community! My name is Shana, and I’m on the Jira Software team. One of the many reasons this Community exists is to connect you to others on similar product journeys or with comparabl...
Connect with like-minded Atlassian users at free events near you!Find a group
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no AUG chapters near you at the moment.Start an AUG
You're one step closer to meeting fellow Atlassian users at your local meet up. Learn more about AUGs