Keyboard and Trackpad stop working on brand new Macbook Pro with Mavericks?
This is a known issue, and a fix is coming.


  Symptoms
  
  Apple is aware of rare circumstances where the built-in keyboard and
  Multi-Touch trackpad may become unresponsive on 13-inch MacBook Pro
  with Retina display (Late 2013) computers and is working on an update
  to resolve this behavior. 
  
  Resolution
  
  If you experience this issue, reset the keyboard and trackpad by
  closing the computer’s display for approximately one minute and then
  open it.


Sources: MacRumors.com, Apple Knowledge Base