On the evening of Nov. 16, Elon Musk unveiled the latest prop in his Tony Stark cosplay. Tesla Inc.’s all-electric semi rig met all the classic Musk product launch criteria: It looked stunning, had unprecedented performance numbers, included features straight out of science fiction, and would arrive at some unknown date at a too-good-to-be-true price from a still-to-be-built assembly line.

Tesla Inc. said the expected price for its all-electric Class 8 truck will range from $150,000 to $200,000.

Elon Musk knows how to make promises. Even by his own standards, the promises made last week while introducing two new Tesla vehicles—the heavy-duty Semi Truck and the speedy Roadster—are monuments of envelope pushing. To deliver, according to close observers of battery technology, Tesla would have to far exceed what is currently thought possible.

Large for-hire carriers and major retailers are reserving their places in line to be among the first to test the all-electric Tesla Semi in their operations.