To quote (just the part about Castle's dad, though):
- "It looks as if we could be meeting Richard Castle's dad next year. Exec producer Andrew Marlowe is considering an "explosively personal" February-sweeps two-parter of ABC's Castle that would introduce the patriarch in a way that would profoundly impact both his son's and granddaughter Alexis' lives.
- What kind of man might he be? "I'm pretty sure he's ruggedly handsome," says Marlowe with a laugh, adding that Nathan Fillion's fantasy choice to play him is Harrison Ford!"
You can read the rest about Castle 2013 from the sources. It tells us something about Bracken, a backstory for Esposito and also possibly for Detective Ryan, and a Valentine's episode!: