Not necessarily.
Most of the avionics will be non-Russian.
Some are Indian, some are a mix of Indo-Israeli and Indo-European, depending on the companies involved, but with Indian IPR ownership for most of them, if not all of them.
For example, the IRST development will happen under an Indian company.
According to the press statement issued by the Ministry, the approval was "for undertaking Design and Development of the Long Range Dual Band Infrared Imaging Search and Track System (IRST) for Su-30 MKI aircraft under 'Make II' sub category and subsequently, for procurement of at least 100 IRSTs under 'Buy (Indian-IDDM) category."
The helmet for the HMDS has also been developed.
DRDO has developed a lightweight HMDS helmet for Indian Air Force pilots flying Sukhoi 30 MKI, Mig 29, Mig 21, LCA Tejas and Mirage 2000 aircrafts.
www.defencestar.in
The only main questions are engine and radar. DRDO has already offered the Uttam radar, with the other options being either Irbis or a new AESA radar. So that gives us at least 3 radar choices. Considering Uttam's current pace of development, it's 1 year away from becoming production-ready, and the IAF's increased emphasis on more and more indigenisation, it's possible it will be chosen. Since the EW suite, cockpit and MC are Indian, the integration will be easier.
As for engine, there are conflicting reports, one saying we will get the new engine, the other saying we will continue with what we have. It's likely the engine decision will be based on cost rather than capability.
Any airframe changes should be the same as SM2, or maybe even more. Personally, I'm hoping for the airbrake to be removed in favour of an extra fuel tank, and they add plumbing for drop tanks. I am also hoping for a significant reduction in RCS and an increase in composites, especially the canards and tail.
iz.ru
