Seeing the other thread about S2 rewards got spammed about some dude not wanting to go support, I'll ask my question in a seperate thread.
Does anyone know the official end-of-S2 rewards? And if so, how are these determined? (Currently sitting at around 1600 elo, just gotta know if I should push it a little bit to 1700 to earn more rewards, or stay at current rating)
They are indeed confirmed. You are currently safely in gold ELO which means you will get the war hero janna skin and a gold badge/border no matter what you do. The next milestone is 1900 which means you get a platinum badge.
since you're already 1600 now you don't have to do anything extra to get the janna skin.
If you want to go for platinum you can though. They also made some tier divisions within the tier's too, which I think give you some kind of border or something idk.