Alongside the Lumia 920 announcement in New York, at a joint event with Microsoft, Nokia announced the Nokia Lumia 820, a follow on to the Nokia Lumia 800. Key features include a 4.3 inch WVGA ClearBlack Display OLED screen, a swappable polycarbonate body, and an eight megapixel camera with Carl-Zeiss optics.

The Nokia Lumia 820 is a significant specification upgrade from the Lumia 800. The processor is upgraded to dual core (1.5GHz), RAM to 1GB, and the 8 megapixel camera is improved. The screen, while staying at 800x480 pixel resolution, is bumped up to 4.3 inches, similar to the Lumia 900.

It also has a number of interchangeable back covers in a variety of colours, some with added functionality such as adding wireless charging capability through the Qi standard that also ships inside the Lumia 920.

Tucked under the cover is space for a user-replaceable microSD card, increasing the available storage space from the built-in 8GB of mass storage. MicroSD card support is one of many new features that Windows Phone 8 brings to the Nokia Lumia handsets announced today

Key updates from Windows Phone 7.5 include an improved Start screen (with the flexible tile sizes extensively demoed on stage), a new Wallet hub for mobile payments and vouchers, an improved mapping platform with both pedestrian and offline turn-by-turn voice vehicle navigation as part of Nokia's navigation suite, additional multitasking scenarios (background processes for GPS, VoIP and instant messaging), and data usage optimisation.

As with the Lumia 920 details on pricing and shipping were not announced - these will follow when the Lumia 820 is close to release in each country.

Key hardware features:

• Size and mass
  • 123.8 x 68.5 mm x 9.9mm
    
  • 160g / 83.5cc
    
• Display
  • 4.3 inch ClearBlack OLED WVGA (800x480 pixels)
    
  • Super Sensitive Touch
  • Nokia ClearBlack with high brightness mode and Sunlight Readability Enhancements 
• Battery
  • 1650mAh with support for Qi wireless charging via exchangable back covers
    
• Processor
  • 1.5GHz Dual Core Snapdragon S4     
• Main camera
  • 8MP Auto Focus with Carl Zeiss optics and Dual LED flash
    
  • Full 1080p HD video capture at 30fps
• Front facing camera
  • VGA
• Memory 
  • 1GB RAM
  • 8GB mass memory with microSD memory card support and 7GB free SkyDrive storage   
• Connectivity
  • NFC
  • Wi-Fi  802.11 a/b/g/n
  • Wi-Fi hotspot (tethering)
  • Bluetooth 3.1
  • AGPS/GLONASS
  • micro-USB
  • 3.5 mm audio
• Sensors
  • accelerometer
  • proximity
  • compass
  • ambient light
  • gyroscope
• Included in the retail box
  • Nokia Lumia 820 handset
  • Nokia Fast USB Charger (AC-50 )
  • Nokia Charging and Data CableCA-190CD
  • Nokia Stereo Headset WH-208
  • Battery BP-5T (1650 mAh)