Following the previously released 15″ Retina MacBook Pro, Apple has just introduced a second Retina laptop model: the new 13″ Retina MacBook Pro, available today for $1,699.

The new laptop is 20% thinner than previous 13″ MacBook Pro models (which are still available at a lower price), and its screen packs 4,096,000 pixels — 4 times the number of pixels than you’d find in the previous generation’s screen (that’s on a 13.3″ diagonal, 2560×1600 pixel screen). The new 13″ model also features a 29% higher contrast ratio, 75% reduced reflection, an IPS display for a wide 178-degree viewing angle and 300 nit brightness.

Diving deeper into the specs, the 13″ MacBook Pro also packs a 720p FaceTime HD camera, as well as dual microphones and stereo speakers that Apple claims “sound better than the previous generation.” The new MacBook Pro, of course, features the standard backlit keyboard and a glass Multi-Touch trackpad.

Screen Shot 2012 10 23 at 10.20.12 AM 520x270 Apples 13 Retina MacBook Pro: 20% thinner, 3.5lbs, 0.75 thick, 7hr battery life, $1,699 available today

As shown in the image below, Apple uses asymmetric Lithium Ion batteries in the new device. You’ll also notice that you can choose either a dual core i5 or i7 processor, with 8gb of RAM and 768GB flash memory. The new 13″ Macbook Pro can be configured with up to 768 gigabytes of flash storage.

Screen Shot 2012 10 23 at 10.22.38 AM 520x304 Apples 13 Retina MacBook Pro: 20% thinner, 3.5lbs, 0.75 thick, 7hr battery life, $1,699 available today

Apple’s Phil Schiller also touted the environmental-friendliness of the new MacBook Pro 13″, saying that it was rated Energy Star 5.2, EPEAT Gold, arsenic, mercury, BFR and PVC-free. While this is somewhat standard for Apple, it’s good to see the company continuing its focus on sustainability.

d6 520x289 Apples 13 Retina MacBook Pro: 20% thinner, 3.5lbs, 0.75 thick, 7hr battery life, $1,699 available today

This machine ships today and we can’t help but believe that it’s going to be a hit. The previous 13″ Macbook Pro was the most popular Macbook (and Mac) in general.

The new Retina 13″ MacBook Pro may not manage to squeeze out the the cheaper Macbook Pro given its higher price, but it will likely sell well as a higher-end option. Learn more here.

 Apples 13 Retina MacBook Pro: 20% thinner, 3.5lbs, 0.75 thick, 7hr battery life, $1,699 available today