Here's a compilation of buffs and nerfs to Ganondorf. Spoiler: There's a lot more buffs. (Green is buff, red is nerf).
Dash speed increased.
Jump height increased.
Jab's sourspot has been removed.
UTilt has significantly less startup and ending lag. It also deals slightly more damage and knockback.
All smash attacks have disjointed hitboxes.
All aerials have significantly less landing lag.
FAir leans forward more like Melee, improving its reach.
FAir's auto-cancel window has been restored after being removed by a glitch in 4.
Grab range improved.
UThrow deals more damage.
Warlock Punch deals more damage and is stronger.
Grounded Flame Choke has less ending lag, increasing the amount of true follow-ups.
Dark Dive has higher knockback, launches at a more horizontal angle, and has less ending lag, increasing its edgeguarding and KO potential. It also deals damage to opponents who trade hits.
Grounded Wizard's Foot travels faster and has significantly less ending lag. The sourspot is also now on the leg instead of the foot, making the sweetspot easier to hit.
New FSmash: Swings a sword overhead in a broad, heavy, slow swing for massive damage (like Ike's FSmash). Compared to his old one, has much more range and deals more damage.
New DSmash: Jabs his sword along the ground on both sides (like Cloud's dsmash) (pointed out by
@DesireDelta). Compared to his old one, has more range, has less startup, semi-spikes opponents, connects better, has a lower hitbox placement that hits crouching opponents, and lowers Ganondord's hurtbox.
New USmash: Swings his sword completely over his head, from one side to another (like Ike's usmash) (pointed out by
@DesireDelta). Compared to his old one, has less startup and much more range.
New FSmash has slightly more startup and ending lag.
New USmash has more ending lag.
UAir has more startup and no longer hits below, making it much worse for edgeguarding and preventing jab locks.
Opponents can mash out of Ganoncide, significantly hindering its utility.