Atm, ServUO/ForkUO isn't getting any new OSI content. Other than minor stuff here and there like the endless decanter.
Instead most of the team is focused on extending the emulator in way that makes it easier to develop for. We are trying to make things easier on us to make in the coming future. While also giving developers tools that RunUO is lacking.
With that said, if someone was to join the team and focus on OSI stuff. We'll be more than happy to work with them and get new stuff in. Although atm, we're trying to make ServUO easier to develop for.