When the CEO of a company that sends rockets to Mars announces that they'll soon be integrating alien technology into their futuristic vehicles, you tend to sit up and take notice. But for Musk, and everyone else on the conference call, it was treated as an 'off-the-cuff' remark that didn't garner anywhere near the attention it deserved.
So what did Musk mean, exactly? Well, when he was discussing a new top-secret powertrain that Tesla was developing, he said ", “[It’s] mind blowing I think. Yes. Coming out later this year, end of the year probably, that’s our goal. Get powertrain up [by] end of the year and then it’s going to be like — this is like alien technology, it’s insane. … Tesla is all about hardcore engineering.”
It's likely that Musk was referring to the upcoming Plaid powertrain, which seems to be being designed around laying the smackdown to the brilliant Porsche Taycan which seems to have well and truly gotten under Musk's skin. The Plaid drivetrain features three engines for improved torque vectoring.
Despite Tesla starting to break past the 400 mile(640 km) range, the Plaid drivetrain will almost certainly set a new benchmark in acceleration. It will likely make use to an economy/power mode to deliver improved range and more efficient delivery of energy. We expect Musk's alien technology to be seen in production cars at the end of 2020.