Hashirama so *** awesome. that guy has a very nice personality.
so many possible things can happen.
1. Minato saying to Sasuke he is Naruto's dad
2. Minato finding out that one of the biggest threats for this world is his student Obito.
3. Hashirama and Tobirama finding out that Madara is "alive"
4. Hashirama finding out Tsunade is presumably dead.
5. Minato finding out his son has made the Kyubi his friend and fully controlls his chakra.
As it seems Hashirama is more kind to the Uchiha which is why i assume Tobirama vs Madara.
No Minato vs Obito though, that has to be "Naruto vs Obito"
The *** is Orochimaru planning?
The *** will Sarutobi do?
all these questions will be answered: