Yep you read it! The Lead Multiplayer Designer at Infinity Ward, Joe Cecot, confirmed we will be able to use fan favorite weapons from older Call of Duties in Infinite Warfare! In his tweet he says after we prestige we are given a Classic Weapon Unlock Token which can be used for any classic weapon. They have not revealed what the classic weapons are yet but we can assume things such as the AK47, and possibly the Intervention as they seem like fan favorites.

What classic Cod weapons do you hope are available?
I hope for the AK47.