Will hopefully help the handheld performance/battery. I know I personally have been waiting for FSR 2 before really getting into BG3 on my deck.
As an odd side note, FSR 2’s addition to the game wasn’t mentioned in the patch notes. Also there’s a negative interaction between TAA and FSR 2, so you’ll have to set anti-aliasing to SMAA or disabled if you want to use FSR 2.
It’s so much better than FSR 1, but there’s a slight 2-3 fps performance penalty in some areas. In particular, I noticed a bit of extra juddering when you get to Last Light Inn.