The HOE of course stands for Hell on Earth. I just think it's funny. Anywho, Doom3Xtreme has posted an interview with the mod leader. D3HOE essentially will strive to recreate the Doom 2 story similar to how Doom 3 recreated the Doom story:
Doom3Xtreme: Tell us a little bit about "Doom 3: Hell on Earth".
Argo: We are going to continue the story of the Doom Marine as he heads back to Earth, battered and bruised and in severe shellshock, only to find his homeplanet is being destroyed by the same enemy that he already thought was defeated during the incident on Mars. We are trying to create the same suspense and horror as the original, and let you travel to various new locations and settings on earth, e.g. an icy, arctic cavern or a deserted city. We plan to implement driveable [sic] vehicles in specific areas too. It'll be great fun! To complete the set of features, we will probably add some MP maps to the mix, about 3 to 5, in "Hell on Earth" environments.
Head over there to check out more you hoe.