Windows 10 confirmed for Lumia 930, 735, and 435
Microsoft has announced that the the Lumia 930, Lumia 735, and Lumia 435 smartphones will be upgraded to Windows 10 as it becomes available.
Microsoft says that Windows 10 has been designed to run well on today’s Lumia phones and the first few phones confirmed that will receive the upgrade are the Lumia 930, mid-range Lumia 735, and the budget Lumia 435.
As for the rest of the Lumia family, the company mentioned that they plan to bring Windows 10 to majority of Lumia phones running Windows Phone 8 and 8.1, however, they admitted that not every phone will be able to upgrade or support all possible Windows 10 features as “certain features and experiences will require more advanced future hardware.”
source: Lumia Conversations