The basic idea was that Russia was going to be removed from the map, much as Poland had been in the 1790's
In 1942 Germany had already annexed the balance of Polish territory into Germany proper. To the east, the conquered territories were being organized into 4 separate areas: Ostland, Ukraine, Caucuses, and Moscow.
Ostland included the former Baltic states and Belorussia. The long term plan there was to exterminate the Jews and other undesirables, encourage German emigration, and eventually assimilate the region into Germany proper.
Ukraine was to get a similar treatment, except it was going to stay a separate territory. Being the "breadbasket" of Russia, immigration of German farmers was to be specially encouraged.
Going east from those territories to the Urals was to be the territory of Moscovy. Germans would emigrate here as well, the existing slavs being either pushed over the Urals or killed. As for Moscow itself...
Hitler determined that Moscow, like Leningrad and Kiev, would be
leveled and its 4 million inhabitants killed to destroy it as a
potential center of Bolshevist resistance. For this purpose Moscow was
to be covered by a large artificial lake which would permanently
submerge it,1 by opening the sluices of the Moscow-Volga Canal.
The Caucuses were to be treated mostly as an imperial possession. Their resources would be at the disposal of the German Empire, and the territory itself in Hitler's estimation would have to be ruled with an iron hand, due to its history of ethnic bickering.
Where does that leave the Russians? I don't think Hitler particularly cared, but by negation it appears the survivors were to be left to Russian Sibera.