Patch notes http://na.leagueoflegends.com/en/news/game-updates/patch/patch-413-notes
Forgot to read yesterday...
I think the elise repel change will be fairly punishing. Graggy's sustain/wave clear's taking a hit. That should tone him down a bit in top lane, but not a huge amount imo.
I think the lee changes cripple (hue) him a bit. No more AS slow is kind of rough. Don't really care that much about the shield duration drop.
olaf = still crap
I don't really think shy needed a nerf, but she got one. dps output down.
lulu changes seem appropriate
I dig the lux buff to passive
Velkoz buffs are decent. Nothing super changing, but good changes.
Yasuo nerfs are good... enough to get him off cow's must ban list? prob not, but I think this is going to hurt him pretty hard. Also, more counter play possible due to reduced shield duration.
ziggs nerf is dumb imo. less ults are possible now on a ss ult.
graves burst potential is up a bit, which is something he needed.
jinx change is kind of wierd. I'm fine with it, but I don't know why that seemed necessary (passive procs on destroying an inhib). Good potential to get in and out or to reposition for kills in the enemy base. Just don't know why she needs the buff on that exactly.
kog nerfed for early/mid game. Nothing much.
The lucian change is welcome. He can no longer remove slows with his dash. This is very welcome, but lowers the skill cap a little bit when playing against him. For instance, early/mid, you had to time when you'd use exhaust to make sure he just couldn't remove it. Now, you don't. I think the increased cooldown will start to move lucian back into a consistent nonban... once people get used to it.
trist - nerfed a smidge
Varus got a nice buff to his ult related to CDR (at level 3 it shaved 20 seconds off).
sona - rework info: http://na.leagueoflegends.com/en/champion-update/sona-maven-of-the-strings
braum - more nerfs. Think he's pretty close to a good place after this. Still think it would have been best to add 1 more hit required to proc his passive.
janna - minor buff
nami - minor nerf
sizable thresh nerf - shield only shields thresh + target. his ult can only dmg a target once
change to team builder
- Players can now unlock new role-themed summoner icons by playing 5 games in Team Builder as a specific role
other thing
Fixed an Undo feature bug with activatable items