Normally I'd write my own piece on this, but IGN, for what THAT'S worth, has written something on it that has quotes and other hoopla.
I'll summarize it though.
Weekly will be mandatory matchmaking, no premade groups or soloing will be allowed.
This is due to numerous complaints that not enough people have access to the content (no friends.... that play), and that it's too easy with friends.
So yeah, how do you feel about that? I'm fine, I hate waiting for people on my FL to sign in, so I'll be able to do then more often and at my own pace.
Note, weekly is the only the affected, not Nights or Raids.