Weekly shipments features Old Republic characters which may mean that Jedi Revan will be back within the next week or two.
With the new Legendary, Han's Millennium Falcon most likely coming on January 17th and JTR the following week, it's hard to see Revan coming before the end of the month at the earliest. February is most likely Sith/Dark Side which means Revan may not be back till March at the earliest. I would plan to keep farming for Revan as soon as you can, just in case.
Jedi Knight Revan's event has been confirmed to be named Legend of the Old Republic and is an Ancient Journey event. The event will begin October 18th and was added to the game in today's Content Update.
CG_SBCrumb confirmed that g9 should be fine, the event will return (eventually), and the kit will be revealed next week [Link]
CG_CapGaSP comments on the difficulty of the event being "Not G12" and diffult will be similar to other Journey events. [Link]
Content Update brings Old Republic bundles [Link]
Some event requirement information and date (Oct 18, 2018) has been released [Link]