Well I haven't actually played online yet, I just set up a custom match to look around the new maps without enemies, and retina was gone, so I assume it is the same online
Guys if you check the website it lists some other changes, including the damage for the X6 sniper rifle improved to be a 1 shot kill, and the Charbtek and knife have reduced accuracy
MC4's community manager said that those gamemodes would only be available in custom matches because they provide an unfair advantage to one of the teams.
If they provide an unfair advantage to one of the teams, then why making them in the first place? Those modes are from MC3, and they were my favorite modes there. They never seemed unfair to me I can't either.