Yeah it will most probably reach around $2m. The initial required sum was $1m, but I believe Fargo reduced it to $900,000 so if only $900K is reached, he'll fork out the left himself. He won't need to though I'm sure.
That would be incredible if it hit $2m. He says after $1.5m "the sky is the limit."
"But we’re looking ahead to what we can do if you all back this project in force. At $1.25 million, the money will go primarily into making the world bigger, adding more maps, more divergent stories and even more music.
At $1.5 million, the world gets even bigger. You’ll have more adventures to play, more challenges to deal with, and a greater level of complexity to the entire storyline. We’ll add more environments, story elements, and characters to make the rich world come alive even more. We will even be able to bring Wasteland 2 to OS X for Mac lovers. And after $1.5 million the sky is the limit."
EDIT: From Fargo's Twitter page: "#Linux users. We've heard your requests, and will include a Linux version (in addition to more content) at $1.5 million in pledges."
EDIT 2: $810k - Should reach it's goal by no latter than morning I'm guessing. Tomorrow afternoon at the latest.