if the upgrade does nothing to enhance that and I pay for it what do I get. Also is there precedent for doing it this way?
You get to stay with the current version, which always seems to include improvements and/or enhancements to audio (Matt is a dedicated audio guy), and maybe you get some other things that might benefit you, even if you don't know what those might be, or even that you'd want them later. You also get to support a local, small business, in the USA, and keep about a dozen folks gainfully employed.
It seems that most people are taking the offer for a VERY cheap upgrade as some sort of request for them to update blindly. It's not, in any way, shape, or form, a request for anyone to upgrade. It's an offer to allow the thousands of people that DO want to upgrade to do so for cheap, and to have a part in helping shape the future of the product. I'm sure that JRiver would actually prefer if very few actually took advantage of the HUGE sale, and waited until the product was further along, and paid more later to upgrade. That would be more profitable, I imagine.
No one is being pushed to do something they are not totally comfortable doing. If you need to have a list of what's coming, then you should wait to upgrade. NO ONE is twisting your arm to upgrade now, it's simply an offer to do so, cheaply.
As for precedent, yeah, they've done it this way for years, and it seems to be working quite well for them (and for me). I think there was one version in the last 12 years that I felt might not have been necessary for me to have upgraded, but since it normally costs so little, I feel good about knowing I can upgrade at the lowest cost, so I always purchase early, and enjoy the ride.