A rumour I heard (not official and certainly not from the prototype drive I've just been on, this could be the new colour range:
R56 hatch/ 3-door one, cooper
1) chili red uni
2) Mellow Yellow uni
3) pure silver met.
4) Liquid Silver met.
5) astro black met.
6) pepper white uni
7) new white un named as yet
8) Sparkling Silver met.
9) Dark silver met.
10 Nightfire Red met.
11) Oxygen Blue uni
12) Laser Blue met.
R56 hatch/ 3-doorcooper S
1) chili red uni
2) Mellow Yellow uni
3) pure silver met.
4) Liquid Silver met.
5) pepper white uni
6) new white
7) Lightning Blue met. (Sort of a darker Indi Blue)
8) Sparkling Silver met.
9) Dark silver met.
10) Nightfire Red met.
11) Oxygen Blue uni (Bit like electric blue, non-metallic).
12) Laser Blue met.
Again this is not confirmed and not in any way official.
But from what I've been told, I'd be up for lightning blue.