The PineTab doesn't even have a wifi/bt radio that's supported by its own OS. When you're an OEM and you're choosing what chips you're putting in a design, I think you should stick to chips that are usable. Chips where the manufacturer has written specs and maybe even a driver that transforms "a piece of glass with a lead frame" into something with a purpose.
Anyway, that's just how I feel.
Wait till you see a Mediatek