The OM-1 reviews with enthusiastic conclusions from Amateur Photographer, Imaging Resource and ThePhoBlographer

Preorders:
OM-1 at BHphoto, Adorama, Amazon. GetOlympus.
OM-1 in EU at Calumet DE. Fotokoch DE. Wex UK. Olympus DE, Olympus UK, Olympus FR, Olympus IT, Olympus ES. Olympus NL. Olympus BE. Olympus AT. Olympus CH.
40-150mm f/4.0 at BHphoto, Adorama, Amazon. GetOlympus. Calumet DE. Wex UK.
12-40mm II at BHphoto, Adorama, Amazon. GetOlympus. Calumet DE. Wex UK.

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People often get lost in analyzing the single spec sheet data but the OM-1 value is much greater than the sum of it’s parts! Here are three conclusions that give you an idea how good the camera is:

Amateur Photographer concluded:

Without doubt, the OM System OM-1 is the best Micro Four Thirds camera currently available, and goes beyond what you would expect from a £2000 camera in terms of subject detection AF, high-speed performance, and the sheer number of useful shooting features available.

Imaging Resource concluded:

The OM System OM-1 makes a great first impression for OM Digital Solutions. For longtime Olympus fans, it’s comforting to know that everything people love about Olympus Micro Four Thirds cameras is still here. In fact, not only is everything still here, it’s better. The OM-1 is more impressive than any previous Olympus camera in just about every way.

ThePhoBlographer concluded:

Through and through, the OM System OM1 is a fantastic camera. It will perfectly suit the needs of most professional photographers who don’t need super high megapixels. Better yet, it’s also great for passionate photographers who just want to have fun. There are lots of fantastic lenses available for it and lots of creative choices photographers can make. And don’t forget about the world-class build quality it has. Combine all that with the small package, incredible battery life, and more!
Is it a perfect camera? No. But most of what needs to be done with it can be done through firmware updates.