The Diablo 3 Beta has been going for a while and a lot of players have been playing on the public test realm (excluding myself... *sigh*) and most importantly, Blizzard has been receiving feedback from the players.
Based on the feedback, Blizzard is going to make quite a few Systems changes, ranging from character attributes being dropped to items being removed.
I'm sure there are a lot of players who will be complaining about the changes, while many more will be supporting it. You just can't keep everyone happy.
What will make more people unhappy though, is that these changes will definitely push the rumoured March 2012 release date back even further. This is where Blizzard shines through of course. Never one to be pressured into releasing a buggy game and patching later (like other game companies), they prefer the game to be perfect when released.
As Jay Wilson, Blizzard's Game Director for Diablo 3 stated:
Our job isn't just to put out a game, it's to release the next Diablo game. No one will remember if the game is late, only if it's great.
And that is why Blizzard is the great games company they are.
Check the source link for a full list of systems that Blizzard are planning on changing.