haflings are still in warhammer today, but they are dogs of war (mercs) they do not belong to any faction. But they are too weak that anyone wants to play with them... only collectors buy them. Citadel havent made any new hafling models for years, but the still produce them, but with old design.
And an idea for magic, you can use the same idea as the "force" from the "star wars galactic conquest" mod. It would be rally cool
And dragons would be awasame, but takes time, could use the cold one model just make them longer and with wings and change some details

just a thought