To have a list of Gems that are not compatible and those that are maybe with a link to the current rails edge branch e.g. 4.2
To add at the bottom of the Rails Edge guide i.e. Ruby on Rails 4.2 Release Notes — Ruby on Rails Guides
This would be very helpful to know when Devise or Bullet works with Rails 4.2, it would help people make a decision when is the time to upgrade. It might also add momentum to Gem Developers to update the Gem, or encourage others to get involved and upgrading it.
Thoughts?