In terms of ERTs- it'd be nice to see both Galactica and Saw on the offerings. It's been a very long time since we've had either, and in that time there's been plenty of new members who won't have had the chance to experience them.
Behind the Scenes is already cropping up quite a bit, and that's something I'd totally be on board with. If we were to have it on a ride, then either Duel or Thirteen would be great to see all the super detailed sets and/or drop mechanisms involved.
And talking of tours- what about an "extended" Heritage tour? It'd be amazing to be led around the Ruins and Gardens whilst hearing all the stories about what they originally were, and it'd be really great if we could see some parts (eg West Wing, Flag Tower, Swiss Cottage etc.) that are always closed.
It feels like we've been lucky with talks in the past as we've generally had something from all the departments, and with a certain birthday next year, it'd be nice if we could have a "celebration" talk, perhaps detailing some of the more obscure bits of history that not even us nerds would know about.
A bit more of a particular thought- as fun as Wicker Man ERT is before the Summer Festival Party, it'd be nice if we could have a different ride. Whilst Wicker is great fun to lap, we've had it a few times now, and the lengthy queues prior meant that the party felt really short (in comparison to 2018).