There were some tweets and comments made by Treyarch that suggested there was more. Nothing too specific or even overly encouraging that there is more, but enough to peak some interest back into the map. Specifically one of the developers telling one of the trusted forum members the orbs weren't glitches, or something like that.
Personally, I gave into the idea its all over after it seemed like someone should have found something by now, but still get curious and enjoy testing new things from time to time. All the comments on here motivated me to try some things out and hang onto some hope. But most likely its nothing.