I was really impressed by Pasynkova's performance during WGP Final Round, I hope she continues that form to WC. She would be my pick for OH2 position, if only for her serves! I think this is Russia's best lineup/rotation for WC:
Pasynkova-Orlova*Fetisova-Goncharova
Kosianenko-Lyubushkina*Shlyakhovaya-Kosheleva
Pasynkova/Kosheleva are one of the best blockers from Position 4, and of course, Goncharova!
The glaring problem really during GP was the lack of scoring alternatives but with Kosheleva back (is it confirmed?!), Goncharova would be less pressured and at least they would be less "predictable".
If only Shlyakhovaya were healthy and ready to play, Russia can at least improve their defense against middle attacks which IMO was their biggest problem, opponents scoring too may points. If not, Zaryazkho would be a good alternate for Lyubushkina as scoring MB but she has not been a really good blocker as far as I can remember.. With that lineup, Orlova/Fetisova would not need to attack really and just focus on the blocking. Lastly, if Malova (and Goncha) continues their great form to WC, and if Kosheleva at least remains stable, I think they can give either US and China a run for their money.