Yes, the pictures in that link are the Cessna "Next Generation Piston" aircraft, aslo dubbed the "Cirrus Killer". I think its highly likely that the engine is a Lycoming, after all Cessna are owned by the company (Textron) that also owns Lycoming. I'd guess that its an IO540, or possibly the recently certified IO580. No cockpit pictures I'm afraid as from what I've read on the web the 'plane only did a fly past, and didn't land.
Cessna also revealed their proof of concept LSA aircraft - there are some
pictures and a
brief descriptionl on Avweb. It looks rather pretty. Interestingly
the registration is reportedly N158CS
Brooklands