So Oya is simply Sylo Smart Wallet ot it is something like addition to it? As I read it gives users faster, smoother user experience in the Sylo Smart Wallet.
Oya is update to decentralize the app. Use nodes and reward with staking. Decentralized messaging experience is what many have been looking for and Sylo is going to deliver.

What is in the Oya launch?
The ability to create your own Sylo Node and provide your own comms infrastructure to the community.
A faster, smoother user experience in the Sylo Smart Wallet. It will now be just as snappy as the likes of Messenger or Whatsapp, but decentralised!