I don't know if this is mentioned or not, but Rosalina's forward throw and backward throw have much weaker knockback than before.
Forward throw now KOs Mario at an Omega Form stage's center if he has over 250% damage; exactly 253% damage if you want to be accurate. Originally, he only needed to take over 215% damage to get KO'd.
Backward throw now KOs Mario at an Omega Form stage's center if her has over 245% damage. Originally, he only needed to take over 195% damage to get KO'd.
Up throw still KOs Mario at over 210% damage, though to be more accurate, he did get KO'd at 214% damage.
Also, in terms of the up smash, uncharged potentially KOs Mario at over 150% damage, while fully charged up smash potentially KOs him at over 110% damage.
All tests were done in Training on an Omega Form stage, with Mario as the test subject.