Blizzard design boss Rob Pardo, speaking to Joystiq, has said that a Diablo III beta is likely, although it doesn't sound like anyone else is going to get to play the demo shown last week at BlizzCon in California.
"I'm sure it will have a beta at some point," said the exec.
"I think this is the only place we're going to show [the demo]," he added.
"We'll probably do something similar for a future show, but we're definitely not going to release it on the internet or anything like that."
There's a full interview through the link.