The wait is almost over for seeing full details and build options for the 2019 Volt. The Volt page now has a selector of "2019" versus the default of "2018" at https://www.chevrolet.com/electric/volt-plug-in-hybrid but clicking 2019 (as of right now) goes to a bad page. I'm guessing that they are in-progress of updating the site with 2019 info but haven't quite finished. Who knows, this might all be moot by the time anyone reads this post 
Can't wait to virtually build my 2019 that is scheduled to be actually built next week!
Can't wait to virtually build my 2019 that is scheduled to be actually built next week!