Our group played the introductory adventure last night, I have been very skeptical about the new rules but after the game last night I am sold.
We did an RPlite session so we could just get into working with the rules and even with the learning and questions the game went very smoothly, I would argue it was more so than our regular sessions using a rule set we are more familiar with.
My biggest fear was that they would be dumbing down the game, fortunately that doesn't seem to be the case and there is as much, if not more depth to the game play and characters as with previous editions.
There is a lot more movement in combat making it feel much more dynamic and exciting and it moves along much more quickly, not that the encounters were easier or anything just that there is a lot less stumbling over rules or other things that interrupt the flow.
All in all I am very pleased with what I've seen so far and can't wait for the full rules release.