Directly from OW's website said:
Sonic Amplifier
Projectile speed increased from 40 to 50
Alternate fire now considers vertical orientation when knocking targets back
Crossfade
Song's area-of-effect radius decreased from 30 meters to 10 meters
A temporary in-game visual has been added to illustrate this radius (it is only visible to L?cio and his teammates)
Heal Song
Healing-per-second has been increased by 50% (also applies to L?cio's Amp It Up ability)
Sound Barrier
Radius decreased from 30 meters to 20 meters
Wall Ride
Movement speed increased by 30% when wall riding
L?cio now receives a burst of speed when leaping off a wall
The AOE reduction hurts bad. Really bad. For reference, Mercy's beam goes out 15 meters. So Lucio has even less range than her now. Everything else seems fun but how will he even be usable since I just go into qp all of the time and grouping up is completely nonexistent. (Even in the few times I go into comp, grouping don't exist.) Basically what I feel like this does is make him better in high-level organized comps (where he's already amazing and almost always a must-pick), and worse in anything lower than that, where he kinda needed a bit of help, but he still felt fine either way so idk
Also I bet $50 that the circle around him to see where his song affects was inspired by the one he has in HotS.