R80.xx is a technology, not a firmware revision. Just like there is a Windows 10 for PC and Windows 10 for IoT for example. And of course nobody expects that hardware limits can be eliminated by software no matter how smart and slick it is. At least I don't.
That said there are technology improvements that do not necessarily depend that much on the hardware but more on other factors - marketing strategy, availability of RnD resources, customer demands, priorities, etc.
An example is the dynamic scheduler. As you know the current one do not utilize the CPU cores very efficiently. The VPN traffic is handled only by one core. The hardware is perfectly up to the task to do dynamic scheduling but it is just not feasible to back port it to R77.20 from R77.30. Once that happens the VPN traffic will be processed by more cores and that's where the boost will come from. Btw, check again the presentation from CPX (VPN boost it is promised there).
I never said that HTTPS inspection and DoS protection are planned, only that I will welcome improvement in this area. And I am sure that even as we speak RnD is making efforts to improve HTTPS inspection in R77.20 because majority of the traffic now days is HTTPS and no adequate security can be guaranteed without scanning it efficiently. It is already not an extra feature but a requirement.