Reynard said:
It's that, but it i also resource management (out the window with per encounter abilities), it is tension (out the door with killing save or die effects) and it is puzzles and tricks and other "player oriented" challenges (the jury is still out on this one, but there is a little hope). What's more is that the "D&D experience" is one that embraces a lot of currently-in-line-to-be-slaughtered sacred cows, in favor of a new paradigm and reimagining of D&D. Again, I understand why, but I don't have to like it.
I don't think resource management is going away. Sure, they have added per-encounter abilities, but there are still per-day abilities as well. It's a good bet that the per-day abilities will be better than per-encounter abilities, so if you blow them all on your first fight, you won't have any for the rest of the day.
I don't think tension is going away. Perhaps tension of the the-life-of-your-character-depends-on-one-die-roll sort is going away, but is that really the tension you want? There's a brief moment of suspense, you roll the die, and then your character is dead or nothing happened. What about the tension of fighting a monster you're not sure you can beat, the tension of rushing to the aid of a nearly-dead character surrounded by enemies, the tension of wondering whether the dragon will breath this round and kill you all...? They're not going away.
I don't think puzzles and tricks and player-oriented challenges are going away. There may not be rules for them, but there weren't rules for them in third edition either. Getting rid of player-oriented challenges is simply not something the designers can, or will try to, do.
I see a lot of people stressing over the fact that vancian spellcasting, and 1d6/level fireballs, and bugbears with 3 hit dice, are being changed. These are
details. The important question is whether the
essence will remain the same. Will it still feel like you are playing Dungeons and Dragons? Will it still be fun? It's perfectly fine to take a wait-and-see-attitude, but don't assume you're no longer in the same forest just because you don't recognize any of the trees.