FC-20 will share NOTHING what can they possibly have in common except some minor avionics? Who says J-XX will be ready in a few years?
China's Jian-12 or J-12 (F-12 for foreign markets) is 5th generation multirole jet due to fly by 2012 and enter service by 2015. It has been codenamed XXJ by US's Office of Naval Intelligence (ONI). J-12 is destined to be China's top-end fighter along with the Su-30MKK when it will be introduced.
For now, China's top-end plane remains J-10, which is basically an Israeli airframe with Russian engines. It is still under development and it is expected that Russian content will increase extensively as the development progresses.
China has developed close ties with Russia's aerospace industry and has license produced many fighters including MiG-21 and Su-27. Their FC-1/Super 7 design is based on MiG-33 (which was rejected by Soviet Air Force). Earlier Chinese planes are the Q-5 Fantan, J-8 Finback and FBC-1. The FBC-1 was their latest attempt, and was'nt successful - the Su-27 filled in for it. Considering their track record, it may well be possible that the J-12 ends up being a re-christened MiG MFI. MAPO-MIG is already involved in the J-10 program. MFI is one of the world's 5th generation designs. However, considering the project's timeframe, it seems unlikely (they would'nt need 15 years to do this).
MiG's MFI project, (project 1.42) was first unveiled to the public in 1999. The production of this promising design unforunately was cancelled due to lack of funds.
Not much is known about J-12 right now - the aircraft is still going through initial work. The project is at is where the USAF ATF (Advanced Tactical Fighter) Program, which lead to the F-22A, was in ~1983. Virtually everything is still wide open. Sources within combat aircraft manufacturer Chengdu confirm that it is looking at a twin-engined design and that they are examining both single and two crew configuration.
Stealthiness is an integral part of all new fighter designs and J-12 is no exception. The engines are most likely to be Russian with Thrust Vectoring. Stealth and thrust vectoring are two features that are a must in all aircraft being designed today. Interestingly, Chinese aircraft designers will actually perform a 'generation leap' if J-12 goes into service with PLAAF. All aircraft produced in China before (apart from licenced Su-27) have been 3rd generation aircraft. Chengdu will have to take Western/Israeli/Russian help to make J-12 truly 5th generation.
J-12's immediate rival will be India's MCA (Medium Combat Aircraft). It too is expected to be a 5th generation aircraft. While the fate of MCA is not clear, J-12 is probably under active development.
J-12 / XXJ 5th Generation multirole fighter - China
and to talk about a few circuits here are some of the many commonalites that i have been able to get out
1)BM/KG300G electronic counter-measures pod
2)KZ900 (electronic reconnaissance) pod.
3)infra-red search and track (IRST).
4)The radar is believed to be designed by the Nanjing Research Institute of Electronic Technology (NRIET), designated KLJ-10 and a smaller variant is claimed to be installed on the JF-17 light-weight fighter (KLJ-7)
5)helmet-mounted display (HMD)
6)ejection seat which is zero-zero capable
7) "hands on throttle and stick" (HOTAS)
8)fly-by-wire flight control system
9) In a rather unusual agreement, the single seat version of the J-10 and the twin seat version of J-10 were designed by two different general designers; Song Wencong for the single seat version and Yang Wei (杨伟
for the twin seat version,
also the general designer of the JF-17 light-weight fighter
10)DSI intake
11)ECM Housing
12)WS-10A (future engine for both ACs) with WS-13 also being a possibility
13) FILAT (Forward-looking Infra-red Laser Attack Targeting)
a few things that i was able to point out more than few circuits (No Offence Intended)