My exploration kitted Vulture has entered the fray

Just in case anything nasty pokes out..
and personally I think this is another wild goose chase. I think the new probe is just a way of confirming to us there is a relationship between the barnacles being engineered and created by the people who also created the probes.
Ehh I don't know about that. The UAs pointed us to Merope, where we first found barnacles, then I think MB said something to the effect of the barnacles aren't the reason they are pointing there, but they're pointing where they are supposed to or something. I think it would be a little strange to introduce a new variant - or whatever relation it has - to the UA solely to say "UAs, barnacles, you know...look!"
I kind of don't think they are made by the same people. UAs are soft and spongy looking, they are corrosive, they explode, and they seem to have some type of intelligence even if it's basic what with the pointing behavior. Now the probes are giving us even more specific instructions.
The barnacles on the other hand are rigid, spiky, machine-like don't really have any "behaviors" to speak of other than making glowy spikes.
My guess is UAs are alien, barns are man-made.