It looks too small to be a heavy gundrone (appears to use the same chassis as the regular gun drones), but the bit that sticks out looks almost exactly like the markerlight on a heavy markerlight drone. I bet its a markerlight.
Edited to add: In that pic the drone is a different color from Shadowsun and her two shield drones and her special "Big Vane" Drone that we dont' know what it does. So I bet it doesn't actually go with Shadowsun, but with stealth suits.
They are two gundrones we don't know, but I'd bet money one is a markerlight drone.
I've heard rumors about Shadowsun extending some sort of cloaking field, either to every unit within X inches (unlikely IMHO) or improving the stealth field of stealth suits out to X inches (more likely IMHO). I'd bet the Vane Drone is how she does it.
just to add to the band wagon, pretty sure it's a marker drone, we know they're coming (I have IA3), that just looks like a marker light (stealth shas'ui's have them under their gun), and we know what the the sniper drones look like.
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