> Extensions and alternatives to Bitcoin Script: several developers discussed on the Bitcoin-Dev mailing list ideas for improving Bitcoin’s Script and tapscript languages, which those receiving bitcoins use to specify how they’ll later prove they authorized any spending of those bitcoins.

I would assume these kind of things require a soft fork at least. I don't quite understand the short term implications of such proposals, but I think I'm beginning to spend enough time on the mailing lists to partition shorter term proposals from long term, big idea ones.