I'll be getting it, looks great.
And as for the boycotting nonsense, people really need to do their homework. I agree that at first glance from the gameplay they have shown it does look very L4D like. However..
"It's a much larger game than the original, and features new co-op and versus campaigns, all-new Survivors, boss zombies, weapons, and items, as well as melee combat."
"Valve has said that they intend on providing more exposition about what may have caused the zombie apocalypse than in the first game, and to try and connect the narratives of the two Left 4 Dead games."
"Players will have access to more and improved weapons, including melee weapons such as a frying pan, an axe, baseball bat, and chainsaw."
"Left 4 Dead 2 features new weapons along with the old ones. One of the new additions is the silenced machine gun. Next is a new assault rifle, it has greater precision and tighter grip than any other rifle."
"In addition to the infected from the previous game, there will be new classes, such as the Charger, a being reminiscent of the Tank from the first game that is able to temporarily stun the survivors by body-charging them and moving incredibly fast, but is significantly weaker and easier to kill. Existing types will have some modifications, including zombies that are immune to fire, and the Wandering Witch that roams the level until disturbed by the Survivors."
Sounds good to me.