I'd like to add since almost everyone seems to be reading it wrong ...
This only affects content you must queue as a team.
Anything you can queue solo in the DF for (which is practically everything listed in this thread) does not use this LB change rule.
Can anyone name a dungeon or trial you must form a group before entering?
If it is legitimately not including Raids, the only thing I can think of is Thordan.
Everything else you can queue solo (as of 3.1).
If it does include Raids (though that isn't stated) this only applies to Thordan and Savage.
Everything else you can queue solo.
If people actually read and comprehended the words written, rather than inferring things that weren't written, we'd have way less panic outbursts during patches. Just read what it says and then ask yourself how this even effects you. What pre-made team strategies could you possibly have for content you've never even done? I'm pretty sure it can't possibly include a LB since it's not out until tomorrow.