I'm surprised more haven't asked yet, why we have two Previews? Ah well, you know the forks (branches to some) are gonna meet up anyway, and we'll get the new Groups system, Estate Land Sales+Covenants WITH the new UI when they combine down the road. It ain't too far.
Just wanted to mention I know I fussed about the ugly little black arrows to show/hide repros on the Support: Known Issues page. It's been totally fixed for some days now, but in case you haven't seen the page yet, you should! Help to know: yup, we're paying attention, we know these are problems, we wanna fix 'em! 