No time soon. Last I talked to the Grails team they were working hard on Grails 7, which would include Groovy 4, Spring Boot 3.x, which comes with supporting new java versions, also figuring bout what to do with GORM and Hibernate deprecating Criteria. I'm not sure what else of hand.
I know a while ago I head someone say that Grails would always be based on spring boot. I think that was premature as Grails now uses Micronaut for the default context, and has various integrations. I think the future underlying of Grails is Micronaut. There is one person who disagrees and created a fork of Grails that turns back time to when it was purely Spring Boot. I don't think the fork has much of a chance beyond being a personal project.
More recently(start of this year)I stopped going to the Grails meetings as I just started a new job at a startup, where I'm using Micronaut instead of Grails. I do miss the convention over configuration, however that does give me more incentive to resurrect my side project of bringing conventional over configuration to Micronaut, but I have to find time to do that project.
Now it's also worth noting that the Grails team has expanded from just Puneet, and help when he needed it, to having several more dedicated members and another active community members.