Take a look at the reserve page.
The rucksack is only going to be released in white, the pochette is going to be in white or pink, and the mini-mini will be in white, pink, or black. I was hoping they would have the rucksack available in black, but no such luck...
Oddly (to me at least), the ship dates of each size are vastly different. The pochettes will be in stock at the beginning of September, the mini-minis will be in stock in mid-October, but the rucksacks won't be in stock until November.