Toy Story 4???

Tom Hanks was recently interviewed by the BBC while promoting his latest film, 'Larry Crowne' which he directed and stars in. When asked about another 'Toy Story' film sequel, Hanks hinted "I think there will be. They're working on it now."
I'm quite suprised that there would be another 'Toy Story' film since the 3rd and assumed final film had a beautiful ending that was great closure for it's avid fans. I'm hoping this won't occur, because it would be rather upsetting to have another sequel just to rake in money and not to continue a beautiful, well told story. What do you think?? Do you think they should make another one?? Please share your thoughts.