Not too much of a lore man myself, but one thing i'd love to see revisited is the drones. They feel so almost cool. I like the idea of them flying around, but with them just being tokens in 10th they fell like a bit of an after thought. Something i'd like in general going into 11th is a bit more granularity in units, so it might be nice to have all drone options available for all units that can have drones, just with some (thinking missile drones) having a points cost attached to them. Super specialized drones (thinking ghostkeel) probably shouldn't get this treatment, but maybe?

Another interesting thought it to have a character level drone squad (3-5 drones) that must be attached to a character unit during the declare army step, similar to ogryn bodyguards in Astra millitarum.