Austria Hungary would be divided like Poland
Yes, a cruel fate but revenge is sweet as the Habsbourg were often the backstaber, they took part in the partition of Poland after the Poles saved Austrian ass in 1683 at the Battle of Wien, and they backstab very quickly the Russian during the Crimean War after be helped to crush the Hungarian Independance.
If Bismarck is still in charge it won't come to that.
At worst he'll accede to his King's initial demands, and insist on annexing Saxony and the Germanophone areas of Bohemia and Moravia. To get a total annexation of Austria you need someone very different in charge. Even Moltke didn't go that far.
Well if Russia get its part, I don't believe they will cry on the fate of Austria, please remember that the lack of help of Austria, even diplomatic, during the Crimean War made Austria a subject of hate in Saint Petersburg. Russia believe that the military help in 1848-1849 was to be rewarded.
I don't believe the Hungarian to cry also about Austrian fate, some minorities in Hungary will prefer certainly still be under Austro-Hungarian rule that under Hungarian rule, but the Magyar will be pleased. Probably the Poles in Galicia will be not pleased to fell under the Russia rule, and the Ruthenian will have mixed feelings as the Greek-Catholic Church will be replaced by Orthodoxy, I believe entire trains of Greek-Catholic priests will be send to Siberia.
Italy will received its part, Istria.
Even the Ottoman Empire will rejoice, I don't believe Hungary so adventurous in the Balkans as a united AH.