+52 Ability Power
UNIQUE Active: Shields your champion, absorbing the next 200 damage (+150% of your Ability Power); lasts up to 4 seconds. 45 second cooldown
Note: This may end up like Hexdrinker and they may scrap it.
Also, about the new champion, nothing much I can tell you. On the PTR Leblanc is selectable but no sprite, picture, spells, not playable, etc.(Leblanc is next)
Edit: Here is a little video of the upcoming Astronaut Teemo.