That's not at all "beyond agile" then, as the thread is supposed to be about. Either you're having the agile conversations with the customer and doing short sprints and regular demos and deliveries or you're not. There's no pushing off things to next release in order to release faster in Waterfall. Either you're delivering everything as promised, or you're doing Waterfall wrong. If you want to adjust to failing Waterfall with more frequent releases and more negotiation, then perhaps you don't want to use the word "agile" but that's what the term is all about.