Well, I had a drive in a Scion iA with the automatic, and I came away very impressed.
The material quality inside was much better than I had expected, and was genuinely surprised by the fit/finish on the dash and on the wheel. The seat cushion was maybe a little short for my taste, but overall, was quite good. There was plenty of room in the back for me with my seat set where I wanted it, although, I didn't care for the way the headrests work. They've got to be adjusted if anyone rides in the back, and that might be a bit annoying.
The steering and brakes were appropriately stiff, and not as far of a departure from my Celica that I've often come to expect. Although I wasn't able to really get into the performance of it, the 1.5L seems more than adequate in regular traffic situations (running up to 45 MPH or so). The automatic popped off shifts pretty crisply, and never really seemed to go running for a top gear if it didn't need to. Or, if it did, I didn't notice. I'd be curious to know how well it'd go through a long sweeper, and it sounds like I'll get my opportunity once the first of the manual-equipped models show up.
More or less, my interest is piqued. The dealer didn't seem like they were expecting as many sales of the iA as the iM, and it sounds like the supply is going to be limited here in Michigan, at least for a bit. Its definitely jumped up to the front, if not the top, of my potential purchase list. A shame we don't have the properly badged, hatchback version...