Along the E-M5III Olympus will also announce the new E-Pl10. No specs have been  leaked yet.

via PR

Here are the detailed leaked E-M5III specs:

Sensor: Live Mos 4/3, 17.4 x 13 mm, 20.4 Mpxl, 4/3 format
Max Definition: [4/3] 5,184 x 3,888
Video definition: C4K (4096 x 2160 pixels, 24p, IPB at 237 Mbps), 4K UHD (3840 x 2160 pixels, 30p, 25p, 24p), 1080p (100p, 50p, 60p, 30p, 25p, 24p), stereo sound
Frame: Micro 4/3
Multiplier coefficient: 2x
Stabilizer: 5 axes on sensor stabilization
Sensor cleaning: Yes, ultrasonic filter (Super Sonic Wave Filter)
Case protection: Anti-dust, anti-run-off, -10 ° C
Wi-Fi & Bluetooth: with OI Share app; connected shooting with Olympus Capture Wireless
GPS / Manometer / Compass: –
Sensitivity: 200-25,600 Iso (Low extension to 64 and 100 Iso)
File formats: Jpeg, Raw (ORF, 12 bit), MOV and AVI (video)
Color space: AdobeRGB, sRGB43rumors
Focusing: Dual Fast AF: 121 points / cross points for phase detection AF; 121 points / AF with contrast detection. All targets, single target (normal / small), group target (5 zones / 9 zones / 25 zones), custom target 1-4 (AF area and adjustable increment)
Exposure mode: PASM, artistic filters
Exposure metering: Multi-zone Evaluative (324 zones), Center-weighted, Spot, Spot Highlights, Spot Lowlights; correction on +/- 5 EV by 1/3, 1/2 or 1 EV
Speeds: shutter with focal plane: 1/8 000 to 60 s, B, T, sync at 1/320 s; electronic shutter: 1/32 000s to 60 s
Burst: 10 fps (AF-C, mechanical shutter)
Self-timer: 2 or 10 s
Miscellaneous: artistic filters, HDR, timelapse, B-exposure with continuous visualization, Raw editing, focus peaking, Live Composite, focus stacking, high resolution
Flash: – (FL-LM3 external flash supplied)
Flash plug: Claw and sync socket
Flash control: Auto, red-eye, backlight, slow sync first or second curtain, manual, wireless flash control; correction on +/- 3 IL
Viewfinder: Oled 2.36 Mpts, 100%, 0.69x, 27mm clearance, brightness and color temperature correction, anti-flicker
Monitor: LCD multi-directional touchscreen 1.04 Mpts
Storage: SDXC / UHS-II 43r
Interfaces: USB 2.0, micro-HDMI, WiFi, microphone input, headphone output,
Supplied accessories: strap, USB cable, flash, battery, flash FL-LM3
Power supply: Li-Ion battery BLS-50 (about 310 images according to CIPA standards)
Dimensions W x D x H: 125.3 x 65.2 x 49.7 mm
Weight: 414 g (SD and rechargeable)

The camera will be announced next week on October 17.

Surprise! You can already preorder the new Olympus E-M5III at Amazon UK (Click here). I bet this link will go offline soon.

Some ulterior info:

• The E-M5 Mark III is a premium model in a small, lightweight enclosure that accounts for approximately 55% of the size of a full-size. Its compact, lightweight design features many of the E-M1 Mark II’s premium features, all with optimal portability.
• Very portable, lightweight, compact and premium with a tropical, frost and water resistant housing for outdoor shooting in harsh conditions.
• Re-engineered 5-axis image stabilisation for low-light images without a tripod even with a telephoto lens.
• The new OLED Electronic Viewfinder provides clear image from edge to edge
• ships November 18 for £1,355.60

Thanks JMA :)