There's also an R. Lee Ermey Voice Pack
Infinity Ward is rolling out a bunch of customization items for the Xbox versions of Call of Duty: Ghosts on Tuesday, April 22. Among that content lineup is a Snoop Dogg Voice Pack for multiplayer. It's exactly what you'd expect, but go ahead and watch the preview above if you'd like.
While writers came up with Snoop's lines for the game, he says "They allowed me to do my thing and put a little Snoopism on top of it." He's done more far-fetched videogame collaborations than this and I'd imagine there's plenty more he'll do in the coming years.
I'd be curious to hear R. Lee Ermey's voice pack. No preview of that one, at least not yet.