Singed's base voice lines have been remastered to sound clearer and cleaner.
Syndra's spell effects have gotten a major visual update for several of her skins, including base!.
SKT T1: Mirroring base changes and added subtle SKT T1 logo in “E” cone.
Snow Day: Pretty big changes, mainly aimed at mirroring base’s and cleaning up the noise.
Justicar: Complete overhaul, should finally be readable.
Syndra has also ben confirmed to get a complete VFX overhaul:
Fixed bug with E castime not being synced up to jump.
Ironspike/Stridebreaker/Goredrinker now properly play the Q animation if cast soon after casting Q.
Max Ferocity: Deals 50 magic damage, restores 50% of the damage taken in the last 1.5 seconds as Health and additionally cleanses Rengar of crowd control.
Rengar roars, dealing 50 magic damage to nearby enemies and grants 10 Armor and Magic Resist for four seconds, increased by 50% for each Champion or Large Monster hit.
: Whenever Rengar eaches 0 ferocity his next leap generates 1 ferocity.
Rengar (These are detailed by and may not arrive in the next update).
I’m sinking any spare time I’ve got from preseason into Rengar and I'll let y'all know when we've locked down his patch date." According to "Rengar’s getting some deep rescripting/cleanup right now which should squash a lot of bugs, but it’ll take a fair bit of time to finish up. These changes were added to the PBE in mid-August, but the release date isn't finalised.
Rengar is getting a big change at some point in the future, thanks to RiotPhlo.