Regarding Stable release of V5

We have build site with v4 for our customer.
All working good.
But they have critical requirement for Content Versioning. i.e. To track any change in content.
I have checked that, it’s available in v5 But it’s in Beta and can not upgrade to v5 Beta.
Any idea when approx v5 Stable will be planed for release? such that we can upgrade to v5 on Production?