The patch on 28th august introduced Mini Springer Kits to the Black Lion chests and apparently one secret miniature, the Mini Springer Ramona (https://wiki.guildwars2.com/wiki/Mini_Springer_Ramona). It should be ingame since two players on GW2efficiency have unlocked this.

I assume it has to be a mystic forge recipe, but given that there are 10 Mini Springer variants available + all the other possible items it is very hard to find the recipe and my attempts have been fruitless so far. I have tried quite a few recipes (too many to list) and none worked so far. But since at least two people have found it, it might be something easy I have missed.

On the other hand it might be something similar to Gaile's frogs in GW1 and only aquireable with help from Anet. (maybe a dev called Ramona?)