Murdock, Fields & Donaghy Joining "Men In Black 3"?

Alec Baldwin, Sharlto Copley and Gemma Arterton are all in negotiations to play parts in the upcoming "Men In Black 3". Baldwin will play the head of MIB back in the 60's, where Jay and Kay will travel back to. Arterton will play a secretery back in the 60's, who will fall in love with the 60's younger Agent Kay, played by Josh Brolin. And finally, Copley will play a alien type character.
If these three actors/actress join the film, then this film is gonna have the one of coolest casts of 2011, other film being "Mission Impossible 4".