I think the artillery sets we all badly need are: early french artillery (artillery 1800-1805, with bricorns), Prussian 1806 artillery, and early Russian artillery. (Austerlitz and 1807 campaign). And Strelets, what about Prussian Landwehr?
The suggestions above show that there are still a lot of topics(and many were not even mentionned) that can be made. I hope strelets will soon inform us about their future plans about Napoleonic and others sets they are planning