Not new info but just my expectation. We have all of them what we need. I'm think process was lived like that ;
1- Gökdoğan BVR missile Land launch ;
Missile range is decrased 3/2 (20-25 km) when launched land. But I think his range not be accepted for siper core missile.
2-) For this reason gökdoğan missile fuel section is enlarged and they maked siper g-40 missile who have range 40 km and can be useable for mid range air defense.
3-After that we see this infographic ;
Siper missile big probably g-40 for first stage and booster for second stage. In my expectation t-300 kasırga missile fuel section and rocket motor can be used for booster. Also possible diameters in infographics approve it.
Kasırga block II carry 190 kg warhead + guidance systems (can be warhead + guidance systems around 250 kg) to 90 km . (total weight is 670 kg) . G-40 kind of missiles around 300-350 kg .
4- So kasırga block 2 fuel section + rocket motor can be carry g-40 missile to 30 km . (90 km total range -45 km range for real range and -15 km for + weight) As you know balistic missiles real range is generally half of his range but hers maximize his altitude after that freefall like a bomb and incrase his ranges. After that first stage can work and g-40 missile can reach +120 km total 150 km .
5- Why +120 km g-40 range. Just because if aa missiles lose his 3/2 range if launched from land. 40 km land launched g-40 missile can be fly +120 km if you reach him aircraft launch conditions with booster.
6- Çafrad çfr and ayr range also 150 km so thats approve me.
7- Also we have teirs s band radar for horizon search and mar-d for semi active guidance until terminal active radar guidance (big probably 65 km ranged gökdoğan active radar seeker will used on siper.) mar-d 85 km (total range of radar 100 km ) after that 65 km gökdoğan seeker.
So
that just a matter of time we will wait and see.