Well the mid year Mage release is announced.
Chmapions with new/reworked abilities:
This is my rough words for more info check out riots official page (also lolking have done a decent write up for those people unable to watch videos)
Vladamir - more focused on using more of his health pool for spells (E is a charge that does more damage) and Q has a stacking mechanic for extra damage and healing
Cassiopeia - can't buy boots, gets MS from passive & W has a new effect called grounding which prevents all movement based abailites (Ezreal E, Flash lantern etc)
Malzahar - W is now hooked directly into R, new W summons minions who then summon more minions, passive is a massive damage reduction when you haven't been damaged for a while.
Zyra - Passive changed to spawning seeds around her randomly (can still plant seeds with W) Q is now a large rectangle, and W no longer gives CDR
Vel'Koz - Ultimate no longer applies passive, getting a 3 proc passive on champions will make ALL spells on that champion for the next 7 seconds deal true damage, Auto attacks and spells will refresh this duration.
Brand - Better at AoE damage, not so great at single target burst anymore, Blaze (passive) stacks 3 times at 3 stacks it detonates damaging all enemies around it then the target is immune to blaze for the next 4 seconds, Ultimate slows if champion are blazed.
Other Mages with unannounced changes:
Annie
Swain
Fiddlesticks
Ziggs
Syndra
Xerath
Anivia
Veigar
Dragon changes:
4 early game dragons will RANDOMLY spawn each granting different buffs.
5th Elder dragon will spawn after 35 minutes, granting a buff similar to the 5th dragon now.
Many item changes including 3 new items and one item finally retires (RIP Will of the ancients)
Check out the site for full changes, far to much to type here.