I think Russia is currently in the "Century Series Fighter Jet" phase that USA had after WW2 only with missiles instead of planes
Basically once you crack the engine technology new platforms that use it just keep coming up at the crazy pace
A very good analogy... jet engines offered potential increases in flight speed performance over propellers, but the fuel consumption meant much shorter range and less endurance.
Over time the jets improved and got more powerful and make supersonic flight practical while range and endurance improved too.
Ramjets have an upper speed limit and are essentially running a very simple jet engine like it was in full AB all the time.
If you need to fly very fast all the way a ramjet makes sense but for most planes the ramjet is not so efficient for takeoffs and landings.
For missiles however a high flight speed could only be achieved by rocket power and rocket power is not very fuel efficient for long range flights.
For intercontinental flights an ICBM makes sense, but before ICBMs could do it there were plenty of ramjet powered super heavy cruise missiles being worked upon.
Interestingly with scramjet motors the top speed limit is shifted dramatically but being a jet engine that scoops up oxygen in flight makes it vastly more fuel efficient than a rocket motor and able to fly much faster than any jet turbine powered aircraft.
Expect to see scramjet engines replacing rocket motors in a range of weapon types from SAMs and AAMs as well as cruise missiles and anti ship missiles... perhaps even ATGMs too.
I guess max.load will be 3 missiles for the Tu-22M3M.
The new missile might just be like a super Zircon in the sense that it will be a long narrow missile that is mostly fuel, with a solid rocket booster to get it up to flight speed and start a long climb to high altitude where it can accelerate and burn fuel and get lighter to a point where it dumps a large section like an external fuel tank and really starts to accelerate and climb... it might even be subsonic for the first thousand kms of flight but that is just speculation on my part.
The point is that the fuel it carries does not need any oxidiser like rocket fuel needs so it will be quarter of the weight of a rocket powered weapon.
It will likely be long and slim so it can be carried internally in the Tu-160 and the PAKDA which will likely be the main carriers of the weapon.
Aren't the Tu-22M3 being tested with a new smaller hypersonic missile (suitable with Su-57 bays) already?
Yes, the Gzur, Mach 6 and 1,500km range... could be carried externally on an Su-57 but most likely about 6m long.
Also, the Tu-160 have new rotary launchers?
To carry Calibr and Kh-101/102 and Kh-555 type missiles... 6 to a weapon bay.