1.The .45 Colt 1911 that is stronger than weaker pistols such as 9mm. The .45 Colt 1911 better have the 3 dot sights (green, white, or red dot sights) and they better not be the half-assed version in BO1. It better be one of the stronger pistols and because it is stronger should be unlocked at a higher level.
2.World at War style gore.
3. If noobtubes are back make sure that if someone uses them they take up a perk slot and/or are not a secondary. Lock-on launchers should be the only available 2ndary launcher.
4. Higher calibers should do more damage, at least for pistols. Example: A .45 pistol packs a lot more of a punch than a 9mm pistol
5. Bling should allow 2 attachments on a secondary weapon