I see you people have gotten to see the patch before me, but there are still people that will be too lazy to look at the site. That's where I come in!
Spoilers contain quotes from Pwyff about related subjects.
Items
I'm starting with the items because they are such a big part of the patch.
Boots of Speed now costs 325 gold (25 cheaper). In addition, all recipe prices for "Tier 2 Boots" increased by 25 (meaning that their total price is still the same).
Doran's Ring now costs 400 gold (75 cheaper), but boasts less health and restores less mana upon killing a unit.
Doran's Shield now costs 440 gold (35 cheaper), but no longer boasts Armor, has increased Health Regen, and blocks less damage from basic attacks.
For Madred's Razors and Wriggle's Lantern, their Rend passives have been dropped and they gain "UNIQUE Passive - Maim: Basic attacks deal X bonus magic damage on hit to monsters." (X varies by item, ex. 100 with Wriggle's Lantern)
Wriggle's Lantern now grants more Life Steal and Attack Damage, but the ward now lasts for 90 seconds (its cooldown has been reduced to 90 as well) and the item grants a little less Armor. The item now costs 2000 gold instead of 1600 (recipe cost is now 500 instead of 100).
Spirit Stone upgrades now deal more bonus damage to monsters, but the AD that Spirit of the Elder Lizard provided has been nerfed, as has been the AP yielded by Spirit of the Spectral Wraith.
The Hunter's Machete, Spirit Stone, and all Spirit Stone upgrades are now available on the Twisted Treeline and Howling Abyss.
Malady has been removed from the game. Its passives have been moved to Wit's End and Nashor's Tooth.
Nashor's Tooth's price has been jacked up, but it gains "Passive: Basic attacks deal 15 (+15% of Ability Power) as bonus magic damage on hit."
Wit's End has a new recipe:
Recurve Bow now costs 900 gold (50 cheaper). This adversely affects all items it builds into, including Wit's End.
Summoner's Rift: The jungle
All non-buff jungle monsters now spawn at 1:55 (15 seconds later than before), but spawn 50 seconds after their death instead of 60.
The Ancient Golem and Lizard Elder now grant more experience, and graphics have been updated to better illustrate buff transfers to their killers.
Young Lizards now grant less experience.
Champions - Important Stuff
Aatrox: "Aatrox, the Darkin Blade is in this build but will be turned on at a later date." Not a bad idea to assume he comes on almost right away given the apparent general feedback from PBE.
Annie's Tibbers got stronger. Much, much stronger. His health at rank 3 has been upped by 50%, he has more Magic Resist, and the Mana cost is now a flat 100, a reduction at all ranks. "We’ve made some changes to Tibbers to make him a tankier and more threatening presence in late game team fights beyond his initial burst damage."
Ashe's passive has been retooled. Only when at 100 stacks can Focus be activated (think Statikk Shiv). It doesn't lose its stacks before then, and builds while she is out of combat.
Hecarim got a lot of tweaking. If his Devastating Charge target is on the other side of narrow terrain, Hecarim will jump to them (ex. ledge across the river from Dragon). Also, Hecarim himself no longer does damage with his ultimate; just his riders, who now deal way more damage than before.
Karma got generous buffs, namely to her Inner Flame and Focused Resolve spells.
Kha'Zix got lots of changes, with focus on Void Spikes. They now slow his targets, have a reduced mana cost, and has higher AD scaling. However, it no longer consumes the passive, and can't be cast during Leap anymore. In addition, Taste Their Fear now deals more damage all around, especially to isolated targets.
Lissandra got a few changes. Her cooldowns on Ring of Frost (and indirectly, Glacial Path) have been reduced, and Ring of Frost's mana cost has been slashed. In addition, Frozen Tomb lasts longer when she casts it on herself, and the slow has been increased at higher levels; however, it does less damage.
Nautilus's Titan's Wrath now does more damage earlier on, but less damage at rank 5 than previously.
Sejuani, that bitch. Good riddance. She deserves every ounce of nerfing that Riot gives her. Sincerely, Shanco, Avarosan.
Sona got a lot of changes. Now she has more health and armor, but her offensive qualities have taken a hit.
Champions - Insignificant Stuff: These champions received very minor stuff that I didn't mention before, mainly bug fixes:
Alistar
Corki
Gangplank
Jayce
Karma
Kog'Maw
Lee Sin
Lulu
Lux
Miss Fortune
Nautilus
Poppy
Singed
Skarner
Sona
Thresh
Varus
Vayne
Vi
Viktor
Vladimir
Volibear
Dominion
Enhanced versions of the items Tear of the Goddess, Manamune, Archangel's Staff and Rod of Ages are now available.ARAM / Howling Abyss
Poros have gone through an 80s action movie training montage and now have some resistance to lasers.
The shop close distance is now calculated from spawn, not from the shop itself. In addition, the distance from spawn in which you will be able to shop has increased.
Other stuff
Your nameplate always appears above others' nameplates.
You may search for items based on their abbreviations and nicknames (ex. bork = Blade of the Ruined King, spooky ghosts = Twin Shadows, dblade = Doran's Blade, etc.)
You will no longer lose your Custom Item sets when you change your summoner name.
Oh, and those sets have been re-enabled.
You have lost access to the Freljord Allegiance summoner icons if you did not complete your ten wins since patch 3.6.
The Key Binding page has been reorganized so it's easier to use.
In the leagues menu, you will now have the option to spectate players and teams in the Challenger tier.
When playing ranked, you will be notified when close to having LP decay for inactivity.
A couple fixes have been made for players playing in windowed clients, as well as players using the Logitech Monochrome keyboard.
And that should...pretty much cover it! The jungle's gonna be the talk of the town for weeks, but apparently so is Teemo, who my brother says is going to be OP with the new changes, but quite frankly, I think that's probably an exaggeration... anyway, let's give these new jungle strategies a shot.