They do have barriers that go up and down backstage, different design though. Those in the photo are not the typical red ones that they use everywhere else, I think you may be right.Me thinks these poles may be able to raise and lower on command.
I don't think that the new gate will be for CMs because the exisiting CM entrance leads directly to the CM area. Going thru the new gate is kinda round about.
Maybe I am giving Disney too much credit, but I like to think that even Disney's barricades are somewhat special. LOL