Yeah, I bet you had to do a double take on that picture. It just plain doesn't look like any other case fan to date. The idea is simple if you think about it. Other case fans place a fan within a frame with space between the two to allow for the propeller to rotate. Antec decided to take a frame and attach the propeller to the face of the frame like an actual aircraft propeller.
The one change to the concept of how to build a PC case fan does two things. The space between the frame and propellers on other case fans creates an area where airflow is choppy and thus noisy. As this space is now gone, the noise level is reduced for the TrueQuiet Pro at the same speed. The second is this space is replaced with more fan blade surface area. Larger blades and the reduction in choppy air at the edges improve air pressure.
The new Antec TrueQuiet Pro 120 will be available at major etailers and retailers for an MSRP of $19.95 right now for those in North America. Europe will get their stock by March 22nd. While I can't say this will be the start of an innovation for all case fans, this could become Antec's new standard for their premium case fan lineups in the future. I hope to see their 140 mm and 230 mm versions forthcoming if these perform as well as Antec claims.