The disign of these missile are different from R-73 and R-77, I don't know for the R-37. The new R-73 is refered as R-74 in some sources.
They look externally the same... they are clearly upgrades of the older types with likely new rocket motors and digital electronics.
Note when the R-23R and R-23T missiles of the MiG-23 were upgraded they called them R-24R and R-24T...
Note the RVV-BD is not on the English version of their website... you have to look on the Russian version to see the RVV-BD. The RVV-BD is not an upgrade of the R-33, it is an upgrade of the R-37 that replaced the R-33.
RVV SD is export name for the R-77-1, the new missile for pak fa is called izdeliye 180 (K-77M) wich is different than R-77 in disign motorization and guidance; new rear fins, new motor, new seeker.
So they say but the only photos I have seen of a PAK FA prototype with weapons shows it carrying the old R-77-1 with the grid rear fins externally.
Those grid fins fold forward for internal carriage and would fit internally as they are now.
The ramjet version would have huge capacities. Hope we will see it someday, however I've read somewhere Russian are satisfied with rocket motor which are very capable today. Even US don't use ramjet missiles.
Ramjet powered missiles would not be worth the effort. Scramjet powered missiles can be much much faster and are much more interesting. The Russians have plenty of experience with ramjet powered missiles... the SA-6 KUB, the Kh-31 family of missiles, and several large anti ship missiles also use ramjet propulsion right now.
I agree. An R-27T would be very dangerous against F-35 however its capacities decrease with a bad weather or with the sun in the line of the lunch. That's why they need a new better missile with a better IR seeker.
Not strictly true.... current IR technologies would suffice and new sensors can be fitted easily.
The real thing is that the missile does not have to lock on at launch... it can be fired at a target detected by long wave radar to intercept the invisible enemy fighter... course corrections can be sent via datalink until it gets close enough to use its own seeker to find and kill the target....
An R-27ET or even a new model scramjet powered version would be interesting....