I wanted to talk with you about that! Nice that you asked.
About the first question, no changes yet. The "features" field in the handshake has been extremely helpful to not have to create a new major version. And we'll try to jeep things that way as long as possible.
About CJXT. The end goal is what you described in your video. But a nice starter would be to hide roles by moving fees to LN somehow.
BTW feel free to open issues for ideas and discussions.
about the LN fees: it's a bit more than a nice starter I think! it would make the system an order of magnitude more useful imo (no fee fingerprint on chain) but I'm curious what you have in mind for how it could work. The way I saw it you essentially would need something equivalent to a submarine swap but with privacy, which means adaptors, which means PTLC and taproot and Schnorr (I'm thinking: payment secret is revealed by publishing signature for coinjoin). Even if that line of thinking is coherent, it's not only complex to implement, but relies on things that don't exist. Perhaps it could be done with ECDSA adaptors, which do exist, but .. well I hope it's already obvious why I always saw it as kind of "out there". Do you have something simpler (or just, better) in mind?
