I reached out to Disney Parks Mom's Panel asking for registration information. This is the answer I received...
"Thank you for bringing your question to the Disney Parks Moms Panel. As
Star Wars Half Marathon Weekend- The Light Side approaches I know runners are eager for more information!
The latest from the runDisney team is that registration will not open until all operational details are finalized. You should see information posted soon on runDisney's website on an early registration date for Disney Vacation Club Members and Annual Passholders to register prior to the general public. Shortly after you'll see the date for general registration. Please continue to check back on the
runDisney website for more information!
May the Force be with you!
-Lindsey ºOº"