Lightning for X means a way to transact in X without waiting for block intervals, for example for micropayments. Eventually it will be used to do rapid atomic s

Lightning for X means a way to transact in X without waiting for block intervals, for example for micropayments. Eventually it will be used to do rapid atomic swaps between tokens, and for this reason it will likely be available for all major tokens. Bitcoin is the slow part of on-chain atomic swaps, so that could be a reason to implement lightning for tokens that already have fast transactions.