Nokia Windows 8 Lumia smartphones
Nokia will show off Nokia's new Windows 8 smartphones on Wednesday in New YorkZheyang Soohoo / Reuters

With the international mobile convention MWC (Mobile World Congress) 2013 event approaching fast, many speculations of product launches are beginning to surface online.

Tech blogs are now buzzing with leaked specs of Nokia's flagship series Lumia 720 and 520, which are reportedly the successors of the mid-range Lumia series 710 and 510.

Leaked specs of Lumia 720 include:

Model

Nokia Lumia 720

(Code-named: Zeal)

Display

4.3-inch CBD(ClearBlack Display)

OS

Windows phone 8 OS

Processor

Dual-core processor with 1GHz

CPU speed

RAM

512 RAM

Storage capacity

8GB

Main camera

6.0-megapixel

Secondary camera

2.0-megapixel

Network

HSPA+

Considering the above specs, the Lumia 720 is a mid-range 3G smartphone with Windows Phone 8 OS as a significant improvement from its predecessor, which had Windows Phone 7.5 OS.

The other aniticipated Nokia smartphone is Lumia 520, which is also expected to be a mid-range device with less standard specs compared to Lumia 720.

Leaked Key Specs of Lumia 520 include:

Model

Nokia Lumia 520

(Code-named: Zeal)

Display

4.0-inch Super-sensitive screen

OS

Windows phone 8 OS

Processor

Dual-core processor with 1GHz

CPU speed

RAM

512MB RAM

Storage capacity

8GB

Main camera

5.0-megapixel

The rumoured Lumia 520 will not feature a secondary camera on the front side like its predecessor Lumia 510.

Rumours are rife that Nokia will launch three news devices, possibly new tablets along with Lumia 720 and 520 smartphones.

According to the community website My Nokia Blog, the Finnish handset maker is expected to launch 'five devices' in the upcoming MWC 2013 which is scheduled to take place in Barcelona from February 25 to 28.