Anthony Hopkins

All I've got to say is I hope this does not interfere with the recording of the ADwD audiobook. ;)

My poorly researched an uneducated guess:

http://www.imdb.com/name/nm0000457/

The only actor I can figure into that last reference of being the Daddy is Ray Winstone, he fits vaguely into the rest of the clues but still, its a stretch

I think a poster on Winter Is Coming has this one!
Bjørn Sørlien guessed Roy Dotrice:
Played in War of the Roses in his youth as king King Edward IV, was a character with the nickname 'Father' on beauty and the beast, was Zeus on Hercules.

...Roy Dotrice, he of "Amadeus" ("poppa!"), "Hellboy II," and lots of other stuff, like, ymmm, "Beauty and the Beast"? Served in WWII. He'd make an excellent maester. :)

Pycelle? or Aemon?

David Warner. He played Henry VI in a War of the Roses UK TV series, and was the "god" (master control program) in TRON.

The big question - is he playing Pycelle or Aemon? We know Pycelle was cast before, but heard nothing about who for a while. Maybe they switched which role he's playing? Could easily see that. Or will Aemon be known as the 'Ancient Maester' in his clue?

The Evil Fuckaire?!

He played Jesus in Godspell, a King in Cinderella, AND he was Daddy Warbucks in the remake of Annie.

Ian Holm ?

Viggo Mortenson?

It's my only guess.

...will make a fine Maester Luwin. :-)

Excellent choice!

Hmm... Ian Holm played in the 1965 TV version of War of the Roses, and has played many kings, though I don't know about the gods. Am I being too optimistic here?