I was just playing on the Public Test Realm and I'm pretty sure that Diablo 3 will finally be ready for release by March 25, 2014, fourteen years after Diablo 2.
Rather than copying characters I started a level one wizard on the hardest difficulty available - Expert - and just played. It's hard to even explain, but it was just a lot more fun than it was at release with only minor changes. Just looking at the paragon system was very exciting. I found a couple of cursed chests and that was a great addition to the game.
I played a little on "Normal" difficulty as well, which should be called "Playing with your chin" difficulty, because I can't imagine any other reason you would want to fight enemies that can't hurt you and elite packs that die to three attacks.
They haven't given me a beta key so I can't test the really fun stuff, though part of me wouldn't want to play Act V until it actually comes out anyway. Still, I'd like to see how "Adventure" mode works, so I hope I get an invite sooner rather than later. Given how many of my suggestions they've implemented so far, I would hope they go ahead and invite me - though realistically I assume they don't know who I am.