Look at Reckless Racing, we're guessing Knights Onrush is taking the same route, because both of the devs have been silenced, this and Reckless Racing dev.
Haha! Guys, just seriously wait. It'll turn up when you least expect it, and it won't be another case of Reckless Racing. Maybe it's just going through Chillingo's thorough checking, and then found some major bugs. You never know.
I'm guessing this is coming out around the same time Reckless Driving is? But hey, if it's polished and fun, I have no problems.
I wish they would say something already I'm hoping they just decided to redo the graphics for iPhone 4 and iPad before they released it so that's what's keeping it.