"-More knockback on down smash (66/34) -> (66/50)
-Improved angle on dash attack (set to 10)
-Faster pummel speed
-More damage on Pound, back aerial, up aerial and neutral aerial (sweetspot) (+1% each)
-Knockback on those attacks adjusted to account for the additional damage
-Improved angle on neutral aerial (set to 25)
Jigglypuff needs a lot of work to be equal to her current superiors, and that work comes in the form of several small changes that add up. The bread and butter of her aerial game has been improved, and the limited facets of her ground game (grabs for damage and dash attack for KOs) have been polished. Pummel speed increase also helps her fight stale moves, which has a huge effect on her game! Finally, the down smash buff specifically helps her gimp Wario, her aerial rival."
http://www.smashboards.com/showthread.php?t=239604