For those interested, relevant sections from the chat logs regarding the Lord Oaks spawn:
18.8. 03:41 +Colibri: the oaks champ is now spawned, it's in 3 different locations in Ilshenar,
18.8. 03:41 +Colibri: it will still spawn approx once a week (a bit faster, but on a very random timer)
18.8. 03:41 +Colibri: BUT! only one of the champ sites will actually have the skull
18.8. 03:42 +Colibri: they will all have an equal chance of getting it, so there's no fight over who gets the skull.
18.8. 03:42 +Colibri: Yep the 3 champs are all active, keep in mind that only one has the skull
18.8. 03:43 +Colibri: one is at the old location, and the other two i'll let you find on your own

18.8. 03:44 +Colibri: the next addition will be so that, if a member of your guild is already a participant
18.8. 03:44 +Colibri: at one of the champ sites, you wont be able to join the others.
18.8. 03:44 +Colibri: but let's just see how this current system goes, maybe it will all be good.
18.8. 03:45 +Colibri: technically, the skull should be diced for
18.8. 03:46 +Colibri: actually, the skull might be diced for by the server and then placed into the player's pack.
18.8. 03:46 +Colibri: (possible future addition)
18.8. 04:24 +Colibri: yep i'm monitorng the oaks spawns a bit
If there were any changes after monitoring then we'll have to wait for the official post to find out what's going on.