I emailed
Disneyland and asked about boarding groups just in case they knew something. This is what they responded:
“Thank you for contacting the Disneyland Resort in California!
We are happy to hear that you are planning an upcoming visit to The Happiest Place on Earth!
We haven't heard at this time. We do have the Virtual Queue.
The Virtual Queue will be used on busy days to help Guests visit Star Wars: Galaxy’s Edge more comfortably.
It will not be needed every day. On some days, it may be used just for peak times of the day.
When it is in use, Digital Boards throughout the Park will display Boarding Group return times, and you can find information on call times for Boarding Groups in the “Important Messages” page on the Disneyland App, in the same place as reservations for Oga’s Cantina and Savi’s Workshop.
Thank you again for your message, and have a magical day!”
So it seems like they aren’t 100% sure what’s going to happen but those of us crazy people going opening day should probably plan to use Boarding Groups similar to the current ones at WDW.