Wagons in the US are an incredibly small market, and manual wagons are sadly a microscopic part of that already tiny market. The STI is sort of in limbo, waiting on a replacement, and the Legacy wagon isn't available here, with only the silly Outback being offered, and that only comes in a manual if you get the base motor. I suppose there is the current Impreza, but that's a snooze and a half.
The next Audi A3 will likely come with an available manual, but it will again be a Haldex setup, not a fully fledged awd setup like the current quattro setups.
Pity, the F31 looks great, but with no manual available for us here, it's currently off my list.