• Tesla has unveiled the next-gen Roadster twice: in 2017 and again on Thursday.
• We list the differences between the two versions.
• Range: down. Price: unknown. Flying: way up!

Tesla just unveiled the revived Roadster.

Sound familiar? It certainly should.

On Thursday, CEO Elon Musk took the covers off the latest version of Tesla's halo sports car and said the EV maker is eyeing production in 2028.

It's the second time the company has unveiled a prototype vehicle that it says will carry on the Roadster nameplate. In 2017, Musk unveiled a smoother-looking and very different type of Roadster.

The 2017 version simply drove onto a stage next to Elon, then spun its tires and raced away. The 2028 version — on a track placed a safe distance away from spectators — drove up a vertical wall, hung upside down, hovered in the air, and did a "kick flip" over a line of other Teslas.

Turns out, a lot can change in nine extra years of product development.

A lot of the nuts and bolts powering the Roadster changed — and so did the car's metrics. So, we put together a chart comparing Tesla's old Roadster promises with the new ones.

Here's what we found: