The distinction as "quickest" is based on acceleration, not overall top speed.
The increased acceleration capability comes from advances in battery technology, which Musk also discussed. He said there will be a new 100-kilowatt hour battery option for both the Model S and Model x that will extend the range of the vehicles.
According to Business Insider, the Model X range will increase to 289 miles and the Model S will have a record-breaking range of 315 miles, making it the first electric car capable of over 300 miles on a single charge.
Current owners of the earlier Tesla Model S P90D can upgrade to the new 100 kWh battery for $20,000.
Read more on the announcement here.
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