That's a very vague question, it depends what you want to know about them. We know that Palin wants them in order to do work for you and now (unless I'm corrected) you know as much as anyone else
It was also answered in this thread yesterday.
It was me who said it and I was speculating, though I think it's a fair assumption.
Tuesday: Barnacle discovered in a different nebula
Thursday morning 02:00 IGT: Zenith confirms the state of the Barnacle in Californian Nebula
Thursday morning 07:00 IGT: Powerplay tick and presumably other server information updated
Thursday evening 18:34 BST: Udo posts that the Barnacle states have changed (this is the confirmed by Zenith and myself)
It seems very coincidental indeed that the morning of the server tick after a new barnacle has been discovered everything changes, but then it could be.