1. 12 hardpoints instead of 10.
2. No air brake which minimizes RCS, increases fuel capacity and allows for the strengthening of the airframe.
3. Stealth coating added to the canopy and nose as well as intakes. RCS is down to 1 meter^2 for most of the front 60 degrees of the airframe.
4. New AL-41F engines with 2 tons more thrust than the baseline Al-31F
5. New ECM system
6. New IRBIS radar and new IRST and RWR, the first new RWR in over a decade.
7. New flight computer and navigation system, new radio, new HUD, new everything.
8. 2 new giant MFD's and 1 touchpad for the ECM system
9. strengthened fuselage and ability to carry more fuel in the spine thanks to the absence of air break and second seat. I think I said this before, sorry
10. The pitot in the nose will be gone in the final product
11. fly by light control system instead of fly by wire. Only the Rafale has a similar fiber optic system. The IRST channel is also fiber optic on this thing and on the MiG-35.
12. Useful life of the airframe is now 30 years and it wont need rebuild until the 10 year mark. Older flankers need rebuild at the 7 year mark. No repairs are needed until the 1,000 hour mark. Before repairs were needed at the 500 hour mark.
13. Almost 2 tons more fuel capacity and a slightly lighter airframe owing to more use of composites and titanium
14. On the downside the cost is up by about 1/3
The Russian air force has said it will in fact procure this version.