My bad.. I looked at the wrong attack. I looked at SPECIALAIRN2MAX instead of SPECIALS2
So Ultimate Uppercut (neutral B 2) has increases in knockback? Could you investigate further? We only noted a difference in charge time in this patch.
I've been looking at Wii Fit Trainer's Side B, and I feel like I see a difference in how long the ball remains active before disappearing. Though I am testing between a 3DS pre-patch and Wii U post-patch. So the ball's duration seems to be reduced by a fixed amount for each bounce. By shooting from high enough that there's only one bounce across FD, I find that the ball stays active for approximately 3 seconds. But in post-patch, it's active for longer, at least 4 seconds (again, my approximation). But there's another testing method.
If you perform a Side B from a ledge hang to shoot the ball low to the ground across a stage, the ball seems to stay active enough to bounce 4 times before disappearing. While in pre-patch, it was active long enough to bounce just twice. The ball is not bouncing quite as high in post-patch, which should explain the increase in the number of bounces. Though there are many things that this could suggest instead of a trajectory change for the ball.
From my testing, I think the ball's duration seems to be reduced by a fixed amount for each bounce, though I'm not certain this is a feature of the ball's function. I had been investigating whether the ball's duration was increased from ~3seconds to ~4+. Other various tests support that the duration was increased - so long as my theory about bounces reducing that duration holds true.
I dunno what sort of verdict to have. All I know for certain is that the move is bouncing differently when performed from a ledge hang. Lowered launch trajectory? Duration increase? Heavier ball? Without a solid testing method, I can't confirm any or a combination of the three confidently.