I am fairly neutral on the ability changes, but they have nerfed his regular abilities quite significantly - assuming the passive will make up for this/is the reason they nerfed other abilities...
Base mana regen increased to 2.5 from 1.92.
Mana regen per level increased to 0.15 from 0.09.
Mana per level up increased to 25 from 20.
Base damage decreased to 51 from 54.
Attack speed per level decreased to 2 from 3.38.
**Toxic Shot (P):**
Basic attacks now deal 8-50 bonus magic damage and leave a Poison DoT that deals 24-180 magic damage over 4 seconds.
Toxic Shot damage (both the on-hit and the DoT) is amped by 50% whenever there are other Poison debuffs on the target
**Blinding Dart (Q):**
Base damage decreased to 70/105/140/175/210 from 80/125/170/215/260.
Mana cost increased to 80/85/90/95/100 from 70/75/80/85/80.
AP ratio decreased to 0.6 from 0.8.
Is now a Poison debuff.
**Move Quick (W):**
No longer breaks stealth.
**Guerilla Warfare (E):**
Cooldown: 40/37/34/31/28 seconds.
After a 2 second delay, Teemo becomes Invisible indefinitely if standing still or in brush, and can move up to 5/6/7/8/9 Teemos while out of brush, but any non-periodic damage from champions will break him out. Teemo can see 25% farther while stealthed. Upon breaking Guerilla Warfare, Teemo gains e20/30/40/50/60% Attack Speed for 3 seconds. While on cooldown, standing in brush will tick down guerilla Warfare’s cooldown faster.
Stealth duration while moving: 2/2.25/2.5/2.75/3 seconds.
**Noxious Trap (R):**
Base damage decreased to 150/250/350 from 200/325/450.
AP ratio decreased to 0.4 from 0.5.
Mushroom max ammo count increased to 3/4/5 from 3 at all ranks.
Traps now become invisible after 1 seconds.