Yay! My "Mini Mochi" was here when I got home, and they sent me the colorway I loved best - Autumn Rainbow!
The yarn is a very soft single, and it's dyed with long color repeats like Noro, but it feels considerably softer than even the Silk Garden Sock, nevermind Kureyon Sock. The colorway I received contains such colors as dull purple, tan with olive green undertones, red brown, fern greens, teal blue - it is a thing of beauty.
Also the balls are the cutest little lenticular shape. I keep petting them.
Now I'm only waiting for the library to get in its copy of "Knitting Socks with Handpainted Yarn" to see if I need to buy a book to go with my yarn...