Tesla Motors brand name will be changed
 

As a fully integrated transportation and energy provider/supplier, they will simply be called...TESLA. Just like classic brand names simplified; International Time Recording Company and Computing Scale Company to IBM, PepsiCola to Pepsi, Apple Computers to Apple, etc. They have already simplified their internet address from teslamotors.com to tesla.com. Anyone looking for the company batteries will be directed to this site. Elon Musk is already the largest shareholder of Solarcity and Tesla Motors, so their trillion dollar market value/merger will most likely be under this one moniker.
Musk says he's ready to launch new Tesla 'master plan' | Reuters

The next two vehicles after the Model 3, are apparently a compact SUV (based on the Model 3?) and a "new kind of pickup truck".

"Expand to cover major forms of terrestrial transport".

After the consumer EV subcompacts and pickup trucks are heavy-duty trucks and high passenger-density urban buses/transports. All with hardware to make them all fully-self driving and with fail-operational capability, meaning that any system breakdown, the car will still be able to drive itself safely. Tesla still believes in fully true autonomous 'riding', it is significantly safer than a person driving by themselves. "You will be able to sleep, read or do anything else enroute to your destination".

https://www.tesla.com/blog/master-plan-part-deux