As far as ranked battle rewards, I think it's current rating, not current league.
And to anyone else who might be reading comments and considering vcdragon's bots, I think the ROI on a new alt account is questionable. My experience is about a 30% win rate with just a few added cards, so they struggle to get out of bronze 3 on their own. And with the changes in bronze rewards, they don't earn a lot from loot chests. It requires significant investment in terms of buying and/or renting cards to get them to "earn" well. I don't know where that breakeven point is. More than I wanted to invest in an alt account.
After the update on Sep 28th, it has been current league which determines the ranked battle rewards.
You can read the update here
https://peakd.com/splinterlands/@splinterlands/game-economy-and-reward-updates
I personally never tried bots before, so I can't give any comment.
But thanks for the helpful insight.
Cheers.
!PIZZA