RS3 ran a survey on future FSW in January this year:
"Whether you were a former player who came back for Fresh Start Worlds, an active player who joined in the experiment, or even if you didn't find value in the event at all, we'd love to hear about your experiences. As we look to the future, we’ll use your insights to understand which aspects we can build on and which aspects we need to change, should we decide to run another limited-time RuneScape event."
https://secure.runescape.com/m=news/patch-week-2---this-week-in-runescape
They definitely showed the interest or they wouldn't run a survey.
RS3 has showed us the latest roadmap, revealing up to November. The interesting thing is what is in their plan in this December, and why did they leave out the last month from what was supposed to be the typical reveal for the rest of the year of 2023?
I think we won't hear anything from the RS3 team until November, as following the reveal pattern of the last 2 years, RS3 isn't allowed to make updates visible until a few days before they released them.