* Lumia 2520 is Nokia's first tablet
* Two large-screen smartphones to compete with Samsung
* Devices to retain Nokia brand after Microsoft handover
* Apple expected to launch new iPads on Tuesday
ABU DHABI, Oct 22 (Reuters) - Nokia has unveiled its first tablet and large-screen smartphones, which will form part of Microsoft's global push to become a leading player in consumer devices when it takes over the Finnish company's handset business.
The Lumia 2520 tablet, along with the Lumia 1320 and 1520 phones are among the last products Nokia developed before deciding to sell the devices unit to Microsoft in a deal that is due to close in the first quarter of next year.
