The forums we moved over are
We did not move the Firefox support forum: that is coming in our next major milestone. These discussion forums join search results as the second component of the site to move over to the new platform.
The new discussion forums are very similar to the old discussion forums. We tried to keep big changes to a minimum. If you see something that doesn’t seem like it’s working right, let us know in the comments here, or in the Contributors’ forum.