As far as I know, there were successful tests of lightning network on the testnet. It will still take a lot of time before it will be implemented on the mainnet and then added to wallets. It's quite interesting to see it but Litecoin has introduced LN much earlier. Steam removed Bitcoin payments a few days ago and now... they are back. Quite amusing, isn't it? Amazon will probably wait a little bit longer. I will pay with Bitcoin as soon as it becomes available. It's pain to cash out BTC in order to buy more GPUs for mining.