No, only one sting per individual target.
However, the tooltip clearly says “only ONE sting per Hunter can be active, on ANY ONE target”.
and If i recall in the past it operated as so.
Don’t get me wrong. I think this is a good change if so. Allows more counter play to multiple targets in PvP, and a rotation change to multiple targets in PvE. Brings more flavor to the class. I hope it sticks, but seems like a bug entirely.
The sting damage itself is fairly minor, even with changes to AP scaling for stings. Not really game breaking or class breaking.