I spent two hours scouring Akihabara tonight looking for the AP-15's. Other than a handful of AP-13's there weren't any lower speed Gentle Typhoons in stock.
Went with an AP-29 for my rad and two S-FLEX SFF21Es for intake instead. I'll keep an eye out in Japan, but the stock of lower Gentle...
You need to connect the USB3 cables to the external ports on the outside of your case (motherboard's I/O plate). It's a pain, and an inconvenience IMHO.
Interestingly enough, Lian Li just released an adapter that will take the PC-9F's USB3 cables and convert them to the new 20-pin USB3...