One thing I always wondered about was sending along metadata with the payment. For example, if a platform wants to accept payment in Bitcoin, but needs metadata sent along to format the billing properly. Sounds like lightning network might be able to provide some options.
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Good questions! You can embed metadata in Bitcoin transactions today using OP_RETURN. There's even a website dedicated to it: http://coinsecrets.org/
With Lightning it's still a Bitcoin transaction so you could do something similar, or there's potential for adding an additional "off-chain" metadata layer on top of the signed transactions as well... definitely an interesting use case that would help avoid blockchain bloat too :)