The Boca Chica will be a testing facility for the SpaceX BFR rocket. True orbital launch operations are unlikely to begin at Boca Chica any earlier than mid-to-late 2019.
The site may eventually become dedicated to launching the Starlink internet satellites. This would rapidly speed up the internet satellite constellation's deployment. The internet satellites would provide a massive source of income for SpaceX.
Currently SpaceX leases three NASA rocket facilities but SpaceX has to share these facilities with United Launch Alliance and others.