What Story DLC’s did rockstar begin filming for GTA V besides Agent Trevor?

We know Shawn Fonteno was working on some dlc as stated by his interview in December 2014, we haven’t heard anything about Ned filming anything but his dlc which was the zombie one was the only other one being worked on as shown by a leak showing the number of missions and their code names, so what DLC’s do you all think they were working on/started to film?