I wonder if there will be a way to tie both RF and RO to Honor of the Guards... My knowledge of the events depicted is a bit rusty right now.
I assume you mean
Valor of the Guards. Stalingrad was (and presumably still is) a very long, thin city spread out along the banks of the Volga. Many miles separate the Factory districts depicted in
RF and the Central Stalingrad district depicted in
VotG.
Furthermore, the campaigns are separated in time as well. By the time the Germans were assaulting the Factories, the fighting in the Central Stalingrad district was essentially over.
So, "linking" the games would (at best) be extraordinarily impractical, and fairly pointless as well.