So two products which don't exist (yet? maybe) and the world's cheapest and probably worst-supported RK3188 stick with clearly inadequate ventilation. And the only one which might have decent GPIO somewhere onboard, if you go to the trouble of hacking some leads on, is the tablet.
I'd love to buy one of those tablets. But this does not answer the question.
You should also be aware that RK3066 is still bad at 1080p, so is RK3188. RK3188 has overheating problems at 1080p so far. RK3066 is just bad at it. Also, the GPU offloading is mediocre. Poor XBMC support, for example, so far. But there is at least good format support in the latest rom, supposedly. So the R-Pi is still pretty good at the most important selling features compared to the price-competitive competition, which is to say 1080p and video support. On the other hand, the USB is pure crap which transcends awfulness. On the gripping hand, cheap USB sticks tend to be overheating little pieces of crap.