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The event just went live and this time the infestation's on Tatooine. Ah, the nostalgia!
This might also be of use to everyone that's doing the event for the first time: http://dulfy.net/2014/08/05/swtor-rakghoul-resurgence-event-is-back-in-tatooine/
There's a link to the necessary guides on that page too. (And here is the direct link http://dulfy.net/2014/01/21/swtor-thorn-rakghoul-resurgence-event-guide/ )
My SWTOR referral link for those wanting to give the game a try. (Newbies get a welcome package while returning players get a few account upgrades to help with their preferred status.)