Here is the announcement from Epic:
We wanted to make sure that we alerted the community that tomorrow's v.41 build has been delayed due to several issues that crept into the build and we're now working to fix.
We will make sure to update this thread and our channels on Twitter and Facebook when the update has been released.
Sorry for the inconvenience. We want to ensure we don't release the build with known stability issues.
And here is a description of his kit:
Knock, Knock! (RMB/R1) - A long-range scoped shot that penetrates geometry. Killing an enemy hero or minion with this ability will refund the mana cost over a short time and reduce the cooldown.
Who’s there? (Q/Square) - Wraith launches a sonar ward that pings its location to reveal nearby enemy Heroes. No line-of-sight restrictions.
Back it up! (E/Circle) - Mark an enemy Hero to warp them back to where they were moments ago.
Surprise, Surprise! (R/Triangle) - Wraith sends himself and nearby allies into the Shadow Plane and grants a movement speed boost.
You can read about his kit here:
Control Aggression (E/Circle) - Passive:
grantsbonus CP to a random minion in the area upon lasthit. Toggle: the Monkey King swaps between offensive and defensive stance. DEF - Defensive stance, OFF - Offensive stance.
Staffof Legend (RMB/R1) - Extends his polearm. OFF: your polearm deals damage and pushes enemies back the length of the staff. DEF: Wukong plants his staff and launches himself into the air with a directional jump.
Cloudwalker (Q/Square) - Passive: Grants the Monkey King a double jump (Spacebar/X). OFF: the jump will end with a slam into the ground which deals damage and slows enemies. DEF: he is able to walk on air following the double jump.
84,000 Hairs (R/Triangle) - When Wukong strikes a minion, hero or structure he will create a clone of himself. The clone cannot move and deals damage in a radius around itself. Damage dealt by clones is based on a percentage of Wukong’s damage.