TL;DR:
Normal dungeons are unchanged.
Heroic dungeons will be changing to be a difficulty of current M0 and will remain queueable, but will drop current M0 loot.
Mythic dungeons will be changing to be a difficulty of current M+10, but will drop current M+10 loot without a timer or affixes.
Mythic+ dungeons will scale loot up to new M+10.
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