Referencing the last patch vs data I noticed today.
I also have only tested a few of these characters:
Bowser:
Appears to have more knock back on attacks
Has more control over Side B Closer to %/earlier
Lucina:
Dspecial while directing down, now combos up to 20-25% assuming no misses.
She can kill around 70% with a Fsmash no charge past the middle of the stage.
Seems to have greater knock back
FSmash does about 15%
Luigi:
(not sure if new)
FSmash (ful charge) can kill near edge at 65%, 90% from center stage
Back throw can kill at 100%
Marth:
Fsmash Tipper near edge can now kill opponents at 20% when the tipper hits resulting in their death at around 45%. Marth can also kill mid stage around 45-55% with a Fsmash Tipper.
Dspecial now does 15-20% damage
FSmash does about 15%, not as great of knock back as Lucina
He can also now spot dodge immediately after shieldbreaker ends.
Ness:
Back throw no longer kills around 90% on edge, now is about 100% with 2-4 jabs and then a back throw.
Uair kills around 120-140% no stale/DV
PK Fire seems to knock back farther with initial hit, also seems to do more damage
(Against bowser, if he is below 10%) Ness' 1st and 2nd hit of his jab inflict no flinching damage.
Shulk:
FTilt now does 11% vs 13%
Can kill at 65% FC USmash
Can kill near edge FC FSmash at 70%
General system notices:
Appears most characters kill potential can now happen around the 120% mark.
Stale Moves/DV appears to not be as strict (not fully tested)
Please note these are just our current findings, we are doing more testing tonight with the same characters and a few others. These were all done on FD or Omega stages on Wii U.