Metabones Speed booster Review & tested on BMPCC by Blunty.

E-M1 review at Amateur Photographer.
A fix for the Apple 10.9 Mavericks and App Nap performance Issues (Phaseone).
Is the Leica 25mm a portrait lens? (M43photo).
Olympus Stylus 1 First Shots posted: How do images taken with this high-end, long-zoom camera stack up? (Imaging Resource).
Olympus 45mm review at Fotooase (German).
Olympus Stylus 1 Review at ePhotozine.
GX7 review at Bestmirrorlesscamerareviews.
Olympus OM-D E-M1, Panasonic GX7, Fuji X100s: Refinement (TheOnlinePhotographer).
E-M1 test at Itmedia.
Stylus 1 – der Taschendrache mit voller Brennweite….(Pen And Tell).
12-40mm lens test at Yodobashi.
Blackmagic Pocket Cinema Camera with a voigtlander 42.5mm lens at Footlessfish.

Image courtesy: Seldomscenephotography

Seldomscenephotography (Click here) posted that long exposure E-m1 vs E-m5 comparison. And also Photolisticlife (Click here) tested the E-M1 long exposure “issue” that was mentioned on other sites. He says it’s basically a non issue:

“I guess I’m trying to say that 99.9% of people taking 60 second or longer photographs will most likely leave the Noise Reduction on auto therefore making this a non issue.  For the rest of you, shoot a dark frame and you can subtract most of the noise out in post processing in no time at all so worry not.”

Admiringlight (Click here) posted a full E-M1 review:

“It’s a lot of money for a mirrorless camera, but given all the features, the extremely tough body with pro-grade weathersealing, the supreme responsiveness, outstanding viewfinder, super deep buffer and excellent autofocus, it’s worth the price.”

And Cameras.reviewed.com (Click here) selected the Olympus E-M1 as camera of the year:

With oodles of manual, customizable control, fantastic image quality, a superb new EVF, and full weather sealing, the E-M1 is a true, professional-caliber mirrorless camera. Paired with Olympus’ new 12-40mm f/2.8 PRO lens, the E-M1 was our favorite camera of all that we tested in 2013.

E-M1 Store Links:
Olympus E-M1 body at Amazon, Adorama and BHphoto, Amazon DE (via DL), Amazon UK (via DL), Amazon ES (via DL), WexUK, Topshot FI, CameraWorldUK.
Olympus M. Zuiko Digital ED 12-40mm f/2.8 PRO Lens at Amazon, Adorama, BHphoto, AmazonDE (viaDL), Amazon ES (via DL).
Olympus E-M1 with 12-40mm Lens kit at Amazon DE (via DL), WexUK and CameraWorldUK, Amazon UK (via DL), Amazon ES (via DL).
Olympus E-M1 with 12-50mm Lens kit at Amazon DE (via DL), WexUK, CameraWorldUK, Amazon UK (via DL), Amazon ES (via DL).
Olympus EP-13 Eyecup for E-M1 at Adorama and BHphoto.
Olympus HLD-7 Battery Grip for E-M1 at Amazon, Adorama and BHphoto.
Olympus LC-62D Metal Front Lens Cap for 12-40mm at Adorama and BHphoto.
Olympus LH-66 Lens Hood for 12-40mm at Adorama and BHphoto.

The E-M1 is right now in Stock via Amazon itself (Click here). The 12-40mm lens is also in Stock via third party resellers (Click here). But the sellers charges you with extra $200 :(