I'm really interested in the Lightning Multi Sig usecases in combination with ecash mints. Easy and more self sovereign uptime, unilateral exit, and distributed trustlessness of LN and Ecash. Add Stable-channels and RailsX esq. stuff and you have access to liquidity yield channels paid in BTC and access to USD Ecash (Huge for normie transition to BTC) and beyond XMR level privacy with recoverability should the device be disabled for both denominations.

Exciting.