Betas get released as non-beta only when all runtimes support all the features. Currently runtimes are in very good shape already with features like clipping and two color tinting (though some runtimes aren't able to support two color tinting). We're currently working on some AnimationState improvements and doing editor-only features. We will wrap up 3.6 soon, which likely will result in some planned features getting pushed to 3.7. Our main goal for 3.7 is audio support and we hope to have a much shorter release cycle than 3.6 ended up being.