Emerald and Obsidian Ranks already have their Miniatures.
So if new ones are to come they probably would have to be bought from Packs.
Here's a answer from TacosBeFriends about Miniatures (Long time ago)
(Bottom line ;) )
Anyway this was some time ago so maybe they are already working on Minis, who knows.
My opinion about this:
It's just one Mini if you could come up with 2 or 3 other Minis then I would highly appreciate it. It sounds nice though, something like a Water Pack!