Be terrified Warren Buffett, be very terrified. 

Tesla (TSLA - Get Report) is set to unveil its "unreal" semi-trailer truck in late October, Elon Musk said.

Musk tweeted late Wednesday night that the much-anticipated truck may be unveiled and test driven on Oct. 26 in Hawthrone. "Worth seeing this beast in person. It's unreal," the Tesla CEO tweeted. 

Musk teased the electric tractor-trailer at the 2017 TED Conference in April with a rendering that shows a mysterious, glowing vehicle. Musk introduced the idea of creating all-electric heavy-duty trucks and urban transport vehicles in a July 2016 blog post. At the time, Musk said the Tesla Semi would reduce the cost of cargo transport and increase safety, while being "really fun to operate."

In April, Musk said the semi truck would be revealed in September.

The vehicle could be a huge disruptor in the trucking industry. In a note to clients late on Wednesday, Sept. 6, Morgan Stanley analyst Ravi Shanker said the Tesla Semi could potentially "set off separation" between leaders and laggards among carriers and shippers, truck original equipment manufacturers and suppliers.

Look out Tesla, Cummins also has a new electric truck!

Shanker predicted that Tesla will price the Semi at about $100,000 (about 70% cheaper to operate than a regular truck, he noted) and start taking orders for the truck at the NACV event, with the vehicle shipping by 2020.

"We believe this could set off competition for intelligent trucks in the industry," Shanker explained. "If the order books fill up quickly, any carrier that holds back placing its order could potentially have to wait several years to get its hands on a Tesla truck -- years during which its competitors could be running with up to a ~70% cost advantage."

He added, "A rush by truck carriers to place Tesla truck orders and other OEMs to launch similar trucks could also be viewed by the market/investors as a key catalyst to the intelligent trucking thesis becoming 'real.'"

It could also be a major disruptor to two of Buffett's key businesses. 

"Autonomous vehicles would hurt us if they spread to trucks," Buffett told shareholders at Berkshire Hathaway's (BRK.B - Get Report)  annual meeting in May. If self-driving trucks become predominant on the roads, it could steal business from Berkshire owned railroad Burlington Northern, Buffett hinted.

Buffett acknowledged that autonomous cars are "coming", and could also "hurt" Berkshire's insurance business Geico. After all, driving hands free is much riskier than driving with two hands on the wheel.
To be sure, Buffett is right that autonomous cars are on the way.
By 2035, more than 12 million fully autonomous vehicles are expected to be sold per year globally, according to research firm BCG.

Tesla Semi truck unveil & test ride tentatively scheduled for Oct 26th in Hawthorne. Worth seeing this beast in person. It's unreal.

— Elon Musk (@elonmusk) September 13, 2017

Tesla Semi truck unveil set for September. Team has done an amazing job. Seriously next level.

— Elon Musk (@elonmusk) April 13, 2017
Annie Palmer contributed to this report.