Ill just create a macro similar to what a lot of tanks have pretty much outlining;
Healings changed, in more ways then one and that i will have to drink, i will go oom if people take to many unnecessary hits, any that i wont be able to keep everyone at 100% all the time (tank excluded).
New dungeons are a learning experince, take it slow and speak up if you don't know a boss/pull.
If anyone starts bitching/moaning, kick and get a (hopfully less ignorant) new dps