MacBook Pro with Retina Display

At WWDC 2012, Apple announced the new MacBook Pro with Retina Display. At the same time, the 17" MBP was discontinued, making the new 15" Retina MBP the most powerful and expensive MBP. The current MBP lineup is: 13", 15" and 15" Retina (2 models of each).

Main differences of the MBP with Retina Display

• 2880x1800 pixels! 220 ppi
• Flash storage. It seems to be using its own flash chips instead of a SSD, which I don't really like. That means you can't replace the HDD yourself, or recover data if it fails.
• No DVD drive, 1.8 cm thick compared to 2.41 cm for the other MBPs
• 2.02 kg compared to 2.56 kg
• New MagSafe 2 port
• HDMI and 2 Thunderbolt ports (other MBPs only have 1 Thunderbolt and no HDMI port)
• Apple says they're re-engineered the fans to be more quiet. The case now takes air from 3 sides. They've also improved the speakers and mic. 

And other changes to the MBPs:

•  Changed to USB 3 ports! It's nice to see Apple using standard connectivity (USB 3 and HDMI).