Diablo III Interview

MTV Multiplayer continues to milk their interview with Diablo III lead designer Jay Wilson by posting a few tidbits about the storyline, possible cameos, and the future of the franchise. World of Diablo?
Wilson also told me that in addition to fan-favorite Deckard Cain, (Diablo III) will feature other characters from (Diablo) lore.

(We also tried to focus a little more on bringing characters back, and not just from '˜Diablo II' but from '˜Diablo I,') he said. (We feel like a lot of the focus is on '˜Diablo II' but '˜Diablo I' started it all and has a lot of really good stuff on the gameplay side and on the character side. So people can expect to see characters from '˜Diablo I,' more characters from '˜Diablo II,' and characters from some of the books. We're definitely going to bring a few of them in.)

And while (Diablo III) ends the trilogy, fans needn't worry it's not the final curtain for (Diablo.) (We're not saying this is the end of the '˜Diablo' universe, but we are trying to bring this storyline to a close,) Wilson said. (It's not just '˜Diablo III' we've got plans beyond.)