Before I start, I’m going to assume that asking for any content that was in TSW but hasn’t been ported over yet doesn’t count as “new” content, and already has a place on the priority list.
New weapons. We were told that a big part of going to the weapon page format from the skill wheel was to allow for the addition of new weapons. Let’s start doing that. Maybe some of the new weapons (reskinned-aux weapons?) can have some slot-able passives that give benefits to things other than just using that weapon. Bring back some of the more granular player build approach that TSW had, rather than just “I will take these passives because they correspond to the active abilities I am using.”
Player housing. I know it’s a big ask, but it’s something that people have wanted for a long time and would be a draw for new players and long-term players alike. Let the player personalize their own little corner of the Secret World. And you know it’ll have plenty of opportunities for micro-transactions.