Jetblue calls the product Mint and it on 321s, not 320s. There is not 'First' but there are two different types of 'Business' or Mint seat: There are 12 lie-flat seats and there are 4 suites.

Seatguru isn't always dependable, but this is their page for the plane FWIW:
http://www.seatguru.com/airlines/Jet...1_transcon.php

And this is Jetblue's page regarding the Mint product, including video of the cabin and information about what routes Mint is deployed on:
http://www.jetblue.com/flying-on-jetblue/mint/