The mass email adverts did promise 2 raids. That's because PoE was originally classified as a raid by the design team. You can go back and look at the data mined images and see that the HoW raid was called "The Arena." So there was no reason for Bungie not to advertise two raids. Things got screwed up when they decided that PoE shouldn't be labeled as a raid. Then the worst PR department in the history of gaming decided to announce "No Raid" in HoW instead of something like "New endgame content featured."