Nikon mirrorless system is called CX. The first cameras will be named Nikon V1 and Nikon J1.

According to Nikonrumors there will be two mirrorless cameras form Nikon (the V1 and the J1). The only difference between the two is that one has a self timer :)

Those are the specs:
10.1MP
ISO range: 100-3200 (with H1-6400)
CCD sensor (not sure about that) – the whole mirrorless line will be called CX, similar to DX and FX
phase and contrast AF detection
Both cameras will have 2.7x crop factor
3 in. LCD screen
The J1 model will have a built-in flash
The V1 will not have a built-in flash but it will have a multi-accessory port which will support external flash and a GPS device
There will be no traditional flash hot shoe on both models
There will be a F-mount adapter
Both cameras will probably be made of plastic
Full HD movie with many additional features
EXPEED 3 processor with 600 megapixels per second processing power

The four mirrorless lenses are (most with choice of colors, except the 10-100mm):
10mm f/2.8 pancake lens
10-30mm f/3.5-5.6 VR lens (very short and portable)
10-100mm f/4.5-5.6 VR
30-110mm VR