Russia did focus on Austria as opposed to Germany. The lion's share of her army went to the invasion of A-H and was wildly successful - for a Great War offensive, anyway. The only change here is to have the armies in Poland sit on the defensive. You'll have to change French policy here, too. Franco-Russian military planning (by about '12, IIRC) rested on the principle that Germany could not possibly withstand major attacks from west and east simultaneously.
I think this change would greatly benefit the Russians. IOTL 2nd Army, IIRC, had an 80 mile march to the frontier. Both forces set off without full complements of men and equipment, organisation was a mess, and there's the infamous radio transmissions in the clear problem, the vastness of the armies and poor comms, which meant the generals were out of touch with their troops, not to mention the sheer bad luck of the German staff officer who'd spent time in Russia and knew assorted handy facts. If the Russians sit on the defensive, they have the time to iron out these problems, and they won't be strung out in line of march. Definitely a better outcome for the Motherland.
Provided the strategic plans remain the same, the invasion of A-H should go pretty much the same, but there's no need ITTL to reinforce Poland, because there's been no disaster. So reinforcements and supplies can trundle off over there, allowing for a further major offensive or two. I suspect the Germans will still have to strip a few divisions off the west, since the Austrians will need the help. A limited German offensive against the Russian's Northwest Army Group (in order to take the pressure off the Austrians) seems plausible, but might not work.