For some reason I’m not entirely happy with the new 2010 BMW Z4 being launched in Detroit (expected in Geneva) at NAIAS, but since I can’t afford it I’ll have to live with it.

Expected to run on a 3.2-liter inline six-cylinder engine that sports 343 hp, the new BMW Z4 claims that the two 3.0-liter naturally aspirated versions that output 300 hp for the Z4 sDrive35i with 300 lb-ft (406 Nm) of torque and 255 hp with 220 lb-ft (298 Nm) of torque for the Z4 sDrive30i, are better. We fail to understand why … but that’s a different story.

With a 7-speed dual-clutch automatic transmission, the EfficientDynamics technology for better performances and its LED-highlighted design architecture makes the new BMW Z4 a real competitor in its niche. However we demanded more and more, because 0 to 60mph in 5 seconds sharp, is not that quick when you pay a lot of money. [via WCF]

The guys at BMWBlog managed to get their hands on a 2010 BMW Z4 brochure image that shows the rear and the folding hard top roof. Rumors on the market say that December 15 is the official date to be announced, while at the Detroit Auto Show it will be officially unveiled for the first time. It sure looks promising and if are to trust previous leaked images (spied in showroom – below) we think it’s going to be a hit.

As for what’s under the hood, the new Z4 is going to pack 2.0-, 2.5-, and 3.0-litre engines, a quick 3.0-litre twin turbo, and a massive 4.0-litre V8 from the M division which will do great with impressing ladies. Like it?