Here are a few specs:
- Ivy Bridge CPU clocked at up to 2.7 GHz with 4 cores
- Geforce GT 650 1 GB of VRAM
- 8 GB of DDR3 1600
The Retina model is thinner and lighter:
The Retina display features a resolution of 2880x1800!!! that's the highest resolution on a laptop!
The RAM is soldered to the motherboard:
There is no more space for a second hard drive.
- 2 Thunderbolt
- 2 ports USB 3.O
- SD card reader
For Ethernet Gigabit and Firewire 800, there are Thunderbolt adapters.
It has a new cooling system, both efficient and silent.
It is available today.
You can see more on the Apple website: