It seems to be what the team used for Sealed PTR early last year, so it's likely that it will be the currency needed to enter (5k stars per pop). Not sure when it will ever be released though, this blog post was a year ago.
https://blog.godsunchained.com/2021/01/29/sealed-deck-approaches/
Thanks for the link, super cool. Maybe i'll keep a couple potential runs saved up now:)