I was thinking that The Mourning and Khorvair would be a great setting for Eberron's second expansion. After the Forgotten Realms, I would rank The Mournland as the second most requested location in DDO.
Dannel's Wrath is a group of Cyrans who are trying to take over Stormreach and Xen'drik as a new Cyre. There is a militia group called Dannel's Wrath who live in a district (basically a refugee camp) off the Marketplace called Dannel's Pride. Dannel's pride is a third home to survivors of the Mourning.
Between the Lord of Blade quest line and this currently unexplored district, there is an easy link to Khorvair, Breland, New Cyre, and the current ruler of the former Cyrans current ruler Prince Oragev ir'Wynarn.
Prince Oragev is well known for sending groups of adventures into the Mournland in search of lost Cyran treasure and lore. In addition to attempting to find tech and resources to aid the founding of a new nation for his people, he also seeks a cause of the Morning.