I've been noticing a bunch of people who used to paddle a ForPlay,wanted something a bit shorter and more playful, but not as small as the Ace. Also, the Pyranha I:3 seems to be a "love/hate" thing so it does not fill the need for everyone.
The Pintail is 7'4" long and has the speed of a slightly longer boat. It is a very forgiving kayak (I should know. It's the only boat that I could paddle for a while after my shoulder surgery) that rolls easily.
Take a close look at the photos and you'll see the similarities and improvements of the Pintail over the ForPlay