Cyanogen has clearly announced that OnePlus One, sold in India through amazon, will receive over the air updates as Cyanogen OS is what makes the One a preferred phone among android enthusiasts and developers.
Micromax’s deal with Cyanogen for The Yu series phones is what has created the entire confusion among the people. Cyanogen’s deal with Micromax too is still solid and the Yu series phones will be developed soon as a direct competition with Chinese manufacturer Xiaomi.