There are two sets released, with three colors in each set. Set 1 consists of light blue, green and red. Set 2 contains blue, orange and silver. Both sets are already available in Japan it seems. The price is 735 Yen (inclusive of tax) per set.
Here's a simple review on the marker by BB Senshi Gunpla enthusiast Apron Person Model Production Diary:
Painted using the marker directly.
Painted using a brush.
Not really that good when applying the markers on black surface it seems. ^^; The colors seem really light.
All images are from Apron Person Model Production Diary