The Neverwinter site has been updated with a new blog post that introduces the new Challenge Campaigns that are designed to bring relevance back to older areas to make them more attractive to endgame players. Campaigns that are considered older and that are not leveling zones will be "scaled to offer a consistent challenge when adventuring in their zones". Three weekly quests sending players off to these specially-designated zones will also be available in Protector's Enclave.
Completing these challenges will rewards players with campaign-specific currency as well as a new currency called a Hero's Medallion. The latter can be traded for a number of things including Companion Upgrade Tokens, Ultimate Enchanting Stones and more.
But wait there’s more! On top of the normal rewards you will receive from those weekly quests, you will also get to choose a Bonus Campaign. Whichever bonus campaign you pick will grant you bonus currency to that campaign when you finish a quest.
Read the full details on the Neverwinter site.