The bard can replace the rogue or the wizard IMO. They have different ways of doing things, but they can do it with their spells and skills.
The druid can replace the cleric or the wizard. I would imagine the new version even moreso for the wizard.
The monk is also a red-headed step child. The new monk might be able to handle themselves better than previously, but we will see.
I don't see the ranger stepping in for the fighter or the rogue. I guess it is a class like a monk. Just there if you happen to already have a big melee in a group that exceeds 4 people.
I have always felt the Ranger should be able to fill the shoes of the main fighter. This version can't. Light armor and d8 hit points is far too weak to deal with powerful monsters.
I guess what really bothers me is they wanted to discourage people from multi-classing the ranger, but the ranger will most likely only be viable when multi-classed as a fighter, just like before. So the change really didn't change much for the Ranger save that people may take a few more levels of Ranger than previously to get decent Reflex saves and track.
Basically, the reason for changing the ranger is moot, so why did they bother? The previous version of the Ranger was a more viable character than the new version, and could easily replace a fighter. The big reason for the change seemed to be that the Ranger was boring and abuseable as a multi-class character because it was an easy to get TWF for rogues. Now it is an easy to pick up good Reflex saves and track. This change is worthless.