It seems that there has been alot of speculation about what the "5'th class" might be. Many/some seems to come to the conclusion that it will be a cleric/healer-type of character. Im not too fond of the idea. To be honest, I die a little bit everytime I hear people talking about a healing class in D3 :P I know that this class wont have all healing/support skills, because every class should have some offensive skills. But I just dont think we need healing in a game where damage is king. A class who supports other chars is nice, but make the skills boost our damage (like fanaticism).
Take a look at Holy Bolt for example. One of the very few healing spells in D2. Did anyone ever use this spell to heal and being serious about it? It just wasnt useful. Yes, it was occasionally used in baalruns when people had nothing else to do. But it wasnt a skill you would put your points in.
And prayer.. hmm.. I dont even want to talk about it. Its just too silly..
So my conclusion is we shouldn't heal to survive, we should kill to survive
Feel free to discuss whether we need a healer in D3 or not
