According to The Hollywood Reporter, Fox 2000 is developing a sequel to the 1993 classic! Robin Williams and original director Chris Columbus are attached to the project, however there's no mention to the rest of the Doubtfire family. Mara Wilson (who played youngest daughter Natalie) has stated she has no interest in returning for the second movie. However Matthew Lawrence (who played the son, Chris) is very excited at the idea. I would have to agree with him! I don't know why this wasn't done sooner...my only hope is they don't ruin the original by scraping together a dumb movie to try to make money.
Enjoy one of my favorite scenes from the original!