I'm not a 4E fan, but I am a D&D fan. It was my first love blah blah, and for many reasons the hobby can't afford for it to fail.
A healthy D&D is a healthy roleplaying industry.
EN World has a good page of the latest 'what we know' news. Check it out at http://www.enworld.org/index.php?page=dnd5e
Can they do the impossible? 'Cause at the moment it's looking like it's going to need a Miracle to deliver all the design goals, and we all know there aren't that many Clerics that can, or will, knock that spell out on demand..