А режим испытаний - это прохождение обычных геров на скорость скорее всего, только с уравниловкой по шмоту для уравниловки условий для всех, т.е. руки будут решать в челленже.
в интервью было заявлено, что режим испытаний будет сложнее героиков. Да, будет таймер. Да, будет уравниловка по шмоту (интересно, что будет с капами и перековкой в таком случае). И золото смогут получить далеко не многие

цитата из интервью с Грегом Стритом
"How are challenge mode rankings going to work? Can we expect worldwide rankings on the official site at some point?
Yeah, what we are doing is dipping our toe into the waters of competitive PvE. This is something players have been excited about every since World of Warcraft came out and now we’re trying to get into that game a little bit to. I don't know if we'll do world wide originally, we will at least do region wide, and that will be on the armory site. Within the game you’ll be able to compare your ranking to your friends and your guildies and things like that. The rating for challenge modes are medals, there is a bronze, silver, gold medal and maybe some stuff beyond that. Bronze will be the kind of thing that if you can finish the dungeon at all (
remember challenge modes are a little harder than heroics) you will probably get bronze. Then after that the time factor starts to be really important,
we don't expect many players to get gold, that may be only a few percentage on each server will get gold and then beyond that we're going to have to start measuring in the fractions of a seconds, into the milliseconds as if you’re doing the 50 yard dash. We think it will be a really big deal when someone is like "Oh someone got a new high score for Shado-pan Monastery!""