I got a couple of things wrong in the previous article. The idea it was only for the SL grid was not right. This release has a version for the OpenSim grids. You can see the highlights of that release on the announcement page: Firestorm Major Upgrade.
Another point on the announcement page is information about the effort that has been put into providing an upgrade path for Phoenix users.
[youtube sM3-yQVDEw]
This video runs a little less than 8 minutes.
The video warns that you will have a slow start because they have flushed all the caches.