Nope. It's a change, my CPO manual says 6 year 100,000 from new. New CPO manual says 4 year 50k from CPO purchase...
The link to the pre-owned warranty coverage is on the the page for each car (under the main specs, left side, below the pictures). Here's the link:
http://www.teslamotors.com/sites/default/files/model-s-preowned-warranty.pdf
The important part, from page 4:
Basic Vehicle Limited Warranty
Subject to separate coverage for certain parts and the exclusions and limitations described in this
Pre-Owned Vehicle Limited Warranty, the Basic Vehicle Limited Warranty covers the repair or
replacement necessary to correct defects in the materials or workmanship of any parts
manufactured or supplied by Tesla that occur under normal use for an incremental period of 4
years or 50,000 miles (80,000 km) from the first day and at the mileage a Pre-Owned Vehicle is
delivered to the first Pre-Owned purchaser, whichever comes first, irrespective of the expiration
date or mileage of the Basic Vehicle Limited Warranty specified in the original New Vehicle
Limited Warranty for the Pre-Owned vehicle.
So the warranty is reset. Buyer gets a fresh 4/50000 from date/mileage at purchase.