As a update to my post here where I needed clarification on some thinigs, I found that clarification and it was as I thought so in case anyone else was wondering here it is.
If your on Vray 3.6 you can get a key for use in r20. Regardless if you migrate to Chaos Group or not your licence still remains perpetual but stuck at the version you have, and will no longer get any support for future upgrades.
Your licence will not work in r21 onwards so you either keep going back to rendering in older versions of C4D or not ever upgrade C4D again to retain compatibility and workflow.
Mirgration I would say is not the correct term to use as your licence is not going anywhere, but to move forward with new tech for Vray its rental only. To receive the same nodes and workstation licence using the rental scheme will cost a arm and a leg, so for someone with 10 render nodes with vat which is not shown on the price is something like £1456 uk pounds per year keeping in mind you actually own nothing at the end of that year. Its not for the hobbyist, its for the professional whom makes back his.her money from using it.
Im not sure if one workstation rental includes its own node for that workstation, if that be the case then its £348 in vat uk pounds. This would mean that if you have invested in a small home render farm your not get any use for it without paying for each node, the cloud would then be the option for animation.
Studios, small and large, high income freelancers can choose to go along with this as it pays for itself, but its still significantly more expensive than what we had.
The migration is essentially offering you a free year of rental for the same feature set of 3.6 only they are calling it 3.7. Any updates added features in that year will be gone as soon as your free migration has ended unless you could afford to rent it. Personalty I dont like getting used to having something I dont own or cant afford to keep unless in that time frame it could earn me money, or you could come to terms and except that what you get used to will be gone and your revert back to using your perpetual version in a version of C4D that is not up to date in which by then it would be into r21, your be going back to r20 or earlier.
Alternatives? Yes there are but non apart from Arnold has both high end hair and skin materials in the same render engine. Vray has many options for decent skin and the ALsurface is so easy to use with great realistic results. Looking at alternatives for skin set up looks painful watching them being set up in comparison, and the results are far from pleasing.
Another spanner in the works for me is Ornatrix, such a nice hair system in development and now I fear I wont be purchasing that due to not getting the support needed for my current version of Vray, we will have to see how that one pans out, but I would have thought work needs to be done both in Vray and Ornatrix.
All in all its very bad news for me, and very good news for the advancement of Vray4C4D and those whom can afford it. As we cant do anything about it, I guess we should feel lucky that if we happen to have a licence at version 3.6 and its working stable for us, we have a perpetual licence that nobody will ever have again unless Chaos group see that there is money to be made from adding other options such as a perpetual licence, yearly maintenance, or rent to own.