I'm also looking for information on this as I have in-laws in Evansville. They're installing a 50A outlet for me, but I can't seem to get them to make it a priority. Currently scheduled to get my Model 3 in less than 3 weeks and have no real way of charging it down there.
I found that
Tesla does own property in Gibson County as of 2017 (Elberfeld is in Warrick county to the east) but it appears to be a manufacturing facility and is a
15-20 minute drive from the nearest exits on I-69 or I-64.
My guess is that it will have to be near the Loves/Flying J/Pilot stop on I-64/US-41 (also Gibson county) several miles to the west of Elberfeld itself, however I've reached the limit of my Internet sleuthing skills.
Edit: I also found
this tweet by Elon yesterday. Hopefully more information to come.