If you haven't read it already, here's yesterday's Coindesk article on Litecoin and Lightning Networks:

http://www.coindesk.com/cross-blockchain-trades-lightning-gives-new-life-atomic-swaps/

Litecoin is now, potentially, the most technologically advanced coin in the crypto-universe with Core developers working on it to deliver full implementations of Lightning, the game-changing 'atomic cross-chain transactions' and other goodies.

"Another point to note: now that SegWit has activated on litecoin, users can begin sending test cross-chain transactions from litecoin to the bitcoin testnet."

When news of full Lightning implementation breaks it will be too late - the train will have left the station.