The Griffins are heading to Springfield

The Simpsons will appear in an hour long episode of Family Guy in the fall of 2014 when Peter & the rest of the Griffin family head out on a road trip and wind up in Springfield. Aptly titled "The Simpsons Guy" the two families will cross paths and quickly become close friends; with each character pairing off with they're counterpart.

Family Guy news - A Griffin will die and be replaced

On the Family Guy panel at this year's Comic Con showrunner Steve Callaghan confirmed that a Griffin family member would perish and be replaced by a new character in the upcoming series. He denies that it's Peter's mother Thelma, who dies in an upcoming episode (possibly due to the real life death of Phyllis Diller in 2012, who voiced the role after taking over for Florence Stanley when she passed away in 2003) but verified that it would be one of the six main characters, though he would not say who exactly.