Dawn of the Infinite is a megadungeon coming in Patch 10.1.5. With the first PTR build, we have the complete list of boss names and abilities from the encounter journal.
Dawn of the Infinite Boss Names
There are eight encounters in Dawn of the Infinite exploring different timeways, including evil Chrome, an Infinite version of Tyr, and a faction-specific encounter where the Horde fights Anduin Lothar and the Alliance fights Garrosh Hellscream.