It is currently on testnet for Desktop OS and iOS. They are planning an Android beta as well.

The great thing about this wallet, besides being behind the actual lightning.engineering company (developer of LND) is that is can use neutrino so it is a new kind of light wallet.

UI is really great, it is quite heavy on CPU during initial synchronization and the bug fixing still continues but hopefully by the time it hits mainnet. It will be a great option for neutrino based Bitcoin Lightning wallets.