According to Billy Murray, the voice actor of Captain price Modern Warfare 4 is in development at Infinity Ward.
ThisisXbox.com writer Jason Andrews met Billy Murray on a flight from Bodrum to London (image below as proof).

Murray said, “Yeah, on Monday I am off to meet Infinity Ward about the next game, Modern Warfare 4, I’m doing work on the sequel to Modern Warfare 3, it carries straight on and I only ever appear in the Modern Warfare games…”
Update: Infinity Ward denies the rumors just like Treyarch did with Black Ops 2, check out the tweet below
Interesting news today, but it’s not true. We’ve not talked with any voice actors, so all news is speculation.
— Infinity Ward (@InfinityWard) October 30, 2012
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Its Billy murray bill murray is a totally different actor!