Again, I don't mean to be a buzzkill but there's probably a reason why all "Godfather" merchandise released so far has been Brando.
Either that's all the license covers or there's a problem with Pacino and they aren't willing to further explore the line without being able to do Michael.
Pacino wouldn't allow his likeness to be used in the "Godfather" game. Granted, that didn't stop the game but there's a difference between replacing Pacino with a generic character among many recognizable characters with authentic likenesses and minimizing his appearances in a $60 game and rolling out a line of high-end collectibles (each of which would cost two or three times as much as the game) and not being able to do Pacino as Michael.
Doing Brando as Vito over and over gets a bit tedious (McFarlane did the 5" figure and the 3-D poster, Sideshow did the PF, Hot Toys and Enterbay are doing 12" figures, Dark Horse has a bust, etc.) but you still really can't complain. He's the most recognizable character in the series (and arguably in film, period) and is what obviously comes to mind when you think "The Godfather" but the second you make another character and it's not Michael you have a problem. It goes from being a perfect 1-character license to a seriously-flawed multi-figure line.
Of all the companies with the license McFarlane probably had the best shot at doing several characters (you'd be able to buy Vito, Michael, Sonny, Fredo, Tom, Clemenza, Tessio, Luca, Neri and Rocco from McFarlane for what the 1 Hot Toys figure will cost) but they didn't.
The game proves that practically every likeness but Pacino is available. There are a few characters not featured in the game (particularly the major female roles, Kay, Connie, Mama etc.) but when you're talking about characters that are natural action figure choices as well they're all in there but Pacino.
I really just think there's a problem with Pacino and that essentially stops everything and anything beyond Vito dead in its tracks. There has to be some reason why such a rich license has been confined to a single character without fail as long as it's been available for merchandising.