We reported /ian-mckellen-andy-serkis-and-hugo-weaving-confirmed-for-the-hobbit/here last week that director Guillermo del Toro confirmed that Hugo Weaving will reunite with Andy Serkis and Ian McKellen in The Hobbit in their roles originated in The Lord of the Rings trilogy." Well according to Moviehole, this is news to not just you, but also to Weaving!
Weaving said he's interested in returning as Elrond, but that he isn't officially on board, because he hasn't been spoken to yet.
"I knew that if and when it happened I'd get a call and we'd chat about it, but I haven't spoken to anyone about it. Someone said to me 'I hear you're doing the Hobbit?' I said 'Well, um, probably', they said "No, no. you've signed on'. I haven't actually talked to anyone about it. Doesn't mean I won't be doing it, [I'm] just not onboard yet."