After viewing the 3D Printing Nerds video on the new V5, I immediately read the information page on the NEW features. To say the least I was underwhelmed. I also did not read anything that gave an indication of free updates after upgrading to V5. We were promised a free V5 upgrade if purchased in a window a couple of years back. So, will V5.1 be a cost upgrade? You should make this clear on your information page. Additionally, I would suggest you offer a trial period for the V5 upgrade so we can test and review your touted improvements to see if it's worth the upgrade cost to us individually. Just a thought, as for now I will not be buying the upgrade, even though S3D is the only slicer I use on most of my printers.
The FAQ should be titled "How will software updates work in the future? What updates are included with V5?"
Concerning the trial period, the V5 upgrade is also covered by our normal 14-day refund guarantee, so you can try it for 2 weeks to see if you like it.