In a sense not too much has changed.
Previously if I didn't like the upgrade I could skip it and stay with what I have. I can do that with the new system as well. Cakewalk are just giving us an option to pay monthly instead.
If X4 was what was now being released we would pay $149 to upgrade from X3 to buy the development work of the last 12 months. Now no change.. on release we are asked to pay $149.
During this year we will get the new components of what would have become X5 as they are ready rather than being packaged for a single release in 2016. AND I won't have to pay for that until after I get them. That is, payment will be due in 12 months time.
Apart from getting features quicker in more manageable bits and having the option to pay monthly in arrears I can't see that there is much change, in the payment model that is. The rest is just benefits to the user. We even get to know what major features are being worked on at any given time. It seems we've been given so much of what we've been asking.
AAnd that doesn't even take into account any of the frog ram features that were getting now and will get over the coming year. But I can see a closer and more consistent interaction between the forum members and Cakewalk staff because we'll be getting more from them.