While not everyone will be pleased that a new feature focuses on more Rifts instead of new content, the Challenge Rifts should offer some enjoyment for players. Blizzard has taken a look at what’s in store.
Challenge Rifts effectively allow players to play with a build created by someone in the community and challenge players to beat their Rift run time with their build. The same Rift with the same build, monsters, pylons etc is played by everyone for the period of a week to find out who can do it fastest.
Why bother? Well, it’s one way to experience another player’s build and there’s Blood Shards and crafting mats up for grabs.
There’s a lengthy explanation, which featured in the video, of the Challenge Rifts on Blizzard’s site.