Last I checked PBE, there were mutterings of Nid nerfs, but not this patch...
Partially because said patch is here! Don't expect too much from this, seeing as it is the patch that Worlds is being played on, but for those of you too lazy to look at the site, here are some quickies.
Patcher Speeds
They estimate that the game will now patch and install slightly quicker.
Skins
The following skins will be released this patch for 975 RP unless otherwise stated:
* = expected to be a limited edition skin
Riot Kayle*
Arcade Miss Fortune - 1350 RP
Dino Gnar
Champions - New to the Institute
Gnar will be arriving this patch.Champions - General
Corki...they said "soon" regarding this bastard...what's that supposed to mean? A nerf? A Visual Upgrade? A joke about him showing up to dominate Worlds every year? No idea. Guess we'll find out soon.
Kassadin must now wait longer for his Riftwalk's mana cost to reset.
Kayle is getting a temporary Attack Speed per Level buff while Riot works on a bug.
Kog'Maw lost some movement speed, and Living Artillery doesn't do as much damage to champions as before.
Maokai's Twisted Advance damage was nerfed hard, and Vengeful Maelstrom now has a maximum duration of 10 seconds.
Morgana also got a set of nerfs, those being directed at Black Shield and Soul Shackles' bases.
Orianna also got the nerf bat, losing some of her base Attack Damage.
Rengar? Yep, Thrill of the Hunt's cooldown got raised and people can sense him from father away. However, if he has the Head of Kha'Zix, he gets bonus vision range from brush.
Xerath now has a minimum cooldown of 0.6 seconds between firing Arcane Barrages (Rite of the Arcane).
Zed was the only champion in this patch lucky enough to get a buff. Death Mark now places Zed behind his target and gives him a buff while the mark is active that allows him to ignore unit collision.
Champions - Insignificant Stuff
These champions got stuff that is by no means special:
Gragas
Kog'Maw
Lulu
Quinn
Rengar
Syndra
Thresh
Zilean
Items
Sanguine Blade: Like really, who cares about this item? It's so bad and nothing was done to make it much better.
Custom Games
Custom game lobbies' maximum number of spectators has risen to 4 from 3. They said it was 2 but...anyway, moving on.
Audio Engine
About 700 MB of unnecesasary audio files were wiped.Suggested Players
In Teambuilder and Normal queues, captains can now invite from a suggested player list. These includes friends in recent premades, and teammates in recent victories.That's it!
Here's what Worlds is going to be played on, minus Gnar whom I imagine will be disabled for the duration of the tournament. With that here's the champs I'm guessing we'll see the most of at Worlds:
Top
Nidalee, Irelia, Mundo, Lissandra (possibles: Alistar, Lulu, Ryze)
Jungle
Jarvan IV, Lee Sin, Elise, Nunu (possibles: Rammus, Hecarim, Kha'Zix)
Mid (assuming that Kassadin will remain permabanned throughout worlds)
Talon, Yasuo, Orianna, Akali (possibles: Zed, Lux, Ahri)
ADC
Corki, Tristana, Ezreal, Vayne (possibles: any ADC but especially Kog'Maw and Graves)
Support
Braum, Thresh, Nami, Morgana (possibles: Karma, Leona, Janna)
Of course, highly speculative. The only way to find out for real is to see for ourselves when Worlds roll around...