I just commented on this story on Twitter, saying how I hope that the team at Treyarch does the porting for the Switch.
Call of Duty: World at War on the Wii had a gore filter. You could filter it on/off as needed, but I'm pretty sure it was the same game single-player wise as the PS3/360 versions, minus HD graphics.
Graphically, the game would be around Wii U levels, so Black Ops II. Other than being graphically downgraded versus the PS4/One versions, I don't know why other features wouldn't be included, unless Nintendo still doesn't have their online Switch act together by then.
If Nintendo gets this right, it could be awesome for the Switch. The FPS genre is one of my favorite/most played, and the Call of Duty games have dominated a lot of my play-time on Nintendo consoles since the Wii, starting with World at War.
I played Black Ops II on the Wii U, and I probably played the majority of my time on just the Wii U GamePad screen. My wife could use the TV for shows, I would be playing online matches in Black Ops II.