The official Lord of the Rings Online site has been updated with a new developer diary by Brian 'Zombie Columbus' Aloisio. The diary goes into great detail about why the team chose to look at and overhaul the Rune-keeper class. Aloisio and team wanted to enhance underused skills, nerfed a few 'overpowered' skills, and to make pathways to power more interesting and varied.
Four Trait set Bonuses
Confession time: the four Trait Set Bonuses were bugged and don't work. Some people knew this, but now everyone who reads this diary will. Fixing them was a high priority for this update, but in the end, we decided that remaking them was the best option. This allowed us to give out a bonus that was more appropriate and (in the case of fire) needed, while avoiding giving a buff that would likely throw balance out the window (in the case of light-ing). The individual buffs we've added are listed below. Remember, these are 100% additions; the bonuses you've seen written in the live tooltips were not having any effect in game.