2. Healing....I was primary healer on our MT during Draigoch and tbh I didn't see much difference. The bubbles kind of suck unless the target actually takes a lot of damage after you put it on them. Basically a purple bar representing the bubble will appear on the target's morale bar that "absorbs" x amount of morale. I think it's around 3000. If the target isn't hit during the 10 second duration, that free morale poofs and they don't get any further benefit. So it's kind of so-so, it's not as good as 40-50% mitigation but it's not horrible.
Rousing Word's new ability is bugged, no one is getting a writ of health after 5 second channel. I'm assuming it will be everyone in the group, however. As long as they are in range long enough to be affected by RW for 5 seconds. So that's pretty hawt.
There's a couple other nerfs related to how effective each heal is now, but I really didn't see much difference. I'm one of the primary healers in our kin for OD on live, so I have a lot of experience healing. I didn't feel "gimped" on test, but this could change on live depending how everything scales at 75. Again, I only really tested any type of group healing on Draigoch.
3. Lightning I barely tested, but I got some 4-5k Shocking words crits so it might still be viable. However, Fire is gonna be super fun and much more dynamic imo.
Hope that helps!