We've developed a new motor, now available for pre-order in the Shop:
http://tinyrc.com/shop/product.php?pid=364
It offers 3.8-like top-speed but with more torque for better all-round performance. You'll notice that it's not labeled as a x.x speed, because its performance is different than any existing 3.2, 3.4, 3.8 etc. that we've tried.