Sounds great, cant wait to play with it!
That swarm cloud looks epic, are the particles flowing from one field with the mushroom cloud motion into another field with the noise pattern?
How did the animated vector fields in those previous posts work? Did you just import one field per frame from a simulation and then lerp between them in engine? (nightmare setup 
)
I know importing fields is still a ways off but is there a possibility of converting other formats to fga? I would love to be able to reference my fumefx or pyro sim folder directly and load in the caches to convert to fga. It could also include an Nth frame option to reduce the total file sizes. A lerp would smooth out the missing frames.
There was an old plugin for unity called megaflow which could do something similar. I dont think it handled animated vectors however you could import a single raw cache from fumefx and have it push around the particles. You could do some interesting things with it.
