Looks like this has mostly slipped under the radar but this is a pretty big change (especially for those of us who exclusively play M+). Moving into SL, it looks like Blizzard is going to decrease the drop rate of gear in M+ to a
single piece in the box at the end of the dungeon. Obviously this could change at a later date but this will effectively neuter one of the easiest ways to gear your toon in the expansion.
Here's the interview, and the specific information from Ion quoted below:
Originally Posted by Blizzard Entertainment
So the exact quantities are still evolving (please don't quote me 100% on this) but notably for Mythic+ it will be one item from the end-of-run chest that is repeatable. The weekly loot chest will still have a greater selection of items to choose from (still one a week) but that should be a more reliable source of upgrades since you can best pick the one that suits your needs out of a wider range of things that you've earned. We're continuing with personal loot and tradability. The baseline reasons for moving away from Group Loot/Master Loot to Personal Loot 3-4 years ago haven't meaningfully changed. I think if anything, some of the potential abuses inherent in Master Loot, where people lose agency or control over their own items--the items now belong to the guild master, or a PUG leader that has arbitrary rules--these things are even more-heightened when things are scarse. So we feel like also without the randomness of Warforged/Titanforging messing with tradability, personal loot should be more consistent then ever in terms of distributing upgrades.
I'm usually a supporter of Blizzard but after seeing the way that Soulbinds are going to work on top of this change to M+ I'm deeply regretting my decision to preorder this expansion.