ZeniMax have started a new series on the official Elder Scrolls Online website called the Loremaster's Archive, with the very first issue dedicated to the not-smelly-at-all-why-do-you-ask topic of the undead. The post differentiates between the four varieties of undead -- Reanimated, Returned, Accursed, and Abominable Miscegenations -- and provides a some backstory as to why people would pursue necromancy as a hobby.
Meanwhile, on the fansite Tamriel Foundry, there's an interview with Lead Content Designer Rich Lambert about the development of the upcoming Craglorn zone. Citing his history of extensive raiding in MMOs, Lambert said that he was excited about developing this high-level group PvE area: "It harkens back to some of the old school games, (ugh I said 'old school') where grouping was really important for survival and stuff was hard."
Lambert goes on to explain the various mechanics and specifics of how group adventures will proceed in the area, so check it out if you've hit level cap already and are ready for the next big challenge.