He might be talking about the "flattening of the roles."
The 0-level rules had a bit of this: because you didn't have a class, you didn't have a role, so you could change your role from round to round with your "power source power." Anyone could drop into being the Leader.
The Barbarian in the Feywild book is supposedly going to be both a Defender and a Striker -- it can do both things. It can help out allies (by taking attacks), and it can also dish out adequate striker damage (with big weapons!).
The basic idea being that you are not locked into a role because of your class. You don't have to be the Helper Guy all the time, but you can be the Helper Guy sometimes, even all the time, if you choose to be.
I think this is a great idea. Not because it encourages self-sufficiency, but because it encourages team play: it is EVERYONE's responsibility to help heal. It is EVERYONE'S responsibility to deal damage.
Thus, someone who plays a Rogue might still be able to drop a heal on someone who needs it. Everyone needs to watch out for everyone else.